21121122012320 has 48 divisors (see below), whose sum is σ = 54434891736288. Its totient is φ = 7680408003840.

The previous prime is 21121122012299. The next prime is 21121122012433. The reversal of 21121122012320 is 2321022112112.

It is a super-2 number, since 2×21121122012320² (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 = 21121122012292 and 21121122012301.

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, 6000316994 + ... + 6000320513.

It is an arithmetic number, because the mean of its divisors is an integer number (1134060244506).

Almost surely, 2^{21121122012320} is an apocalyptic number.

21121122012320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121122012320 is an abundant number, since it is smaller than the sum of its proper divisors (33313769723968).

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

21121122012320 is a wasteful number, since it uses less digits than its factorization.

21121122012320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12000637533 (or 12000637525 counting only the distinct ones).

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

Adding to 21121122012320 its reverse (2321022112112), we get a palindrome (23442144124432).

The spelling of 21121122012320 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, twelve thousand, three hundred twenty".