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1011211220 = 225435572111
BaseRepresentation
bin111100010001011…
…101101111010100
32121110202212000102
4330101131233110
54032332224340
6244201433232
734026103445
oct7421355724
92543685012
101011211220
11479890a58
1224279b818
13131664146
14984292cc
155db98215
hex3c45dbd4

1011211220 has 48 divisors (see below), whose sum is σ = 2177860608. Its totient is φ = 394181760.

The previous prime is 1011211193. The next prime is 1011211231. The reversal of 1011211220 is 221121101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477965 + ... + 480075.

It is an arithmetic number, because the mean of its divisors is an integer number (45372096).

Almost surely, 21011211220 is an apocalyptic number.

1011211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088930304).

1011211220 is an abundant number, since it is smaller than the sum of its proper divisors (1166649388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011211220 is a wasteful number, since it uses less digits than its factorization.

1011211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720 (or 2718 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1011211220 is about 31799.5474810570. The cubic root of 1011211220 is about 1003.7231939562.

Adding to 1011211220 its reverse (221121101), we get a palindrome (1232332321).

The spelling of 1011211220 in words is "one billion, eleven million, two hundred eleven thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 43 86 172 215 430 557 860 1114 2111 2228 2785 4222 5570 8444 10555 11140 21110 23951 42220 47902 90773 95804 119755 181546 239510 363092 453865 479020 907730 1175827 1815460 2351654 4703308 5879135 11758270 23516540 50560561 101121122 202242244 252802805 505605610 1011211220