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21103331220 = 22335233159929
BaseRepresentation
bin10011101001110110…
…110100011110010100
32000110201122022011000
4103221312310132110
5321204423044340
613410021343300
71344650232666
oct235166643624
960421568130
1021103331220
118a4a30a104
12410b567b30
131cb415394a
141042a50536
15837a5dd30
hex4e9db4794

21103331220 has 384 divisors, whose sum is σ = 71995392000. Its totient is φ = 5115432960.

The previous prime is 21103331213. The next prime is 21103331237. The reversal of 21103331220 is 2213330112.

21103331220 is a `hidden beast` number, since 2 + 110 + 3 + 331 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21103331193 and 21103331202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 22715716 + ... + 22716644.

It is an arithmetic number, because the mean of its divisors is an integer number (187488000).

Almost surely, 221103331220 is an apocalyptic number.

21103331220 is a gapful number since it is divisible by the number (20) 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 21103331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35997696000).

21103331220 is an abundant number, since it is smaller than the sum of its proper divisors (50892060780).

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

21103331220 is a wasteful number, since it uses less digits than its factorization.

21103331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21103331220 its reverse (2213330112), we get a palindrome (23316661332).

The spelling of 21103331220 in words is "twenty-one billion, one hundred three million, three hundred thirty-one thousand, two hundred twenty".