21110221220120 has 32 divisors (see below), whose sum is σ = 47601030319920. Its totient is φ = 8425771585920.

The previous prime is 21110221220119. The next prime is 21110221220171. The reversal of 21110221220120 is 2102212201112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572384522 + ... + 572421401.

Almost surely, 2^{21110221220120} is an apocalyptic number.

21110221220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110221220120 is an abundant number, since it is smaller than the sum of its proper divisors (26490809099800).

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

21110221220120 is a wasteful number, since it uses less digits than its factorization.

21110221220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144806395 (or 1144806391 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21110221220120 its reverse (2102212201112), we get a palindrome (23212433421232).

The spelling of 21110221220120 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty".