21021021110120 has 64 divisors (see below), whose sum is σ = 47743885728000. Its totient is φ = 8329055931648.

The previous prime is 21021021110083. The next prime is 21021021110153. The reversal of 21021021110120 is 2101112012012.

It is a super-2 number, since 2×21021021110120² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21021021110095 and 21021021110104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15838529 + ... + 17114351.

It is an arithmetic number, because the mean of its divisors is an integer number (745998214500).

Almost surely, 2^{21021021110120} is an apocalyptic number.

21021021110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021021110120 is an abundant number, since it is smaller than the sum of its proper divisors (26722864617880).

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

21021021110120 is a wasteful number, since it uses less digits than its factorization.

21021021110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279722 (or 1279718 counting only the distinct ones).

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

Adding to 21021021110120 its reverse (2101112012012), we get a palindrome (23122133122132).

The spelling of 21021021110120 in words is "twenty-one trillion, twenty-one billion, twenty-one million, one hundred ten thousand, one hundred twenty".