21232121012120 has 64 divisors (see below), whose sum is σ = 47930098835520. Its totient is φ = 8464818645504.

The previous prime is 21232121012077. The next prime is 21232121012177. The reversal of 21232121012120 is 2121012123212.

It is a super-2 number, since 2×21232121012120² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21232121012092 and 21232121012101.

It is a congruent number.

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, 23624837 + ... + 24507083.

It is an arithmetic number, because the mean of its divisors is an integer number (748907794305).

Almost surely, 2^{21232121012120} is an apocalyptic number.

21232121012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232121012120 is an abundant number, since it is smaller than the sum of its proper divisors (26697977823400).

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

21232121012120 is a wasteful number, since it uses less digits than its factorization.

21232121012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884244 (or 884240 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21232121012120 its reverse (2121012123212), we get a palindrome (23353133135332).

The spelling of 21232121012120 in words is "twenty-one trillion, two hundred thirty-two billion, one hundred twenty-one million, twelve thousand, one hundred twenty".