1021121011220 has 24 divisors (see below), whose sum is σ = 2144377751208. Its totient is φ = 408443904000.

The previous prime is 1021121011217. The next prime is 1021121011271. The reversal of 1021121011220 is 221101211201.

It can be written as a sum of positive squares in 4 ways, for example, as 40993291024 + 980127720196 = 202468^2 + 990014^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021121011195 and 1021121011204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2050820 + ... + 2499620.

It is an arithmetic number, because the mean of its divisors is an integer number (89349072967).

Almost surely, 2^{1021121011220} is an apocalyptic number.

1021121011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021121011220 is an abundant number, since it is smaller than the sum of its proper divisors (1123256739988).

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

1021121011220 is a wasteful number, since it uses less digits than its factorization.

1021121011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562571 (or 562569 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021121011220 its reverse (221101211201), we get a palindrome (1242222222421).

The spelling of 1021121011220 in words is "one trillion, twenty-one billion, one hundred twenty-one million, eleven thousand, two hundred twenty".