21232331220320 has 96 divisors (see below), whose sum is σ = 54728740039680. Its totient is φ = 7719827351040.

The previous prime is 21232331220311. The next prime is 21232331220361. The reversal of 21232331220320 is 2302213323212.

It is a self number, because there is not a number n which added to its sum of digits gives 21232331220320.

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, 12587921 + ... + 14174639.

It is an arithmetic number, because the mean of its divisors is an integer number (570091042080).

Almost surely, 2^{21232331220320} is an apocalyptic number.

21232331220320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232331220320 is an abundant number, since it is smaller than the sum of its proper divisors (33496408819360).

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

21232331220320 is a wasteful number, since it uses less digits than its factorization.

21232331220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594348 (or 1594340 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21232331220320 its reverse (2302213323212), we get a palindrome (23534544543532).

The spelling of 21232331220320 in words is "twenty-one trillion, two hundred thirty-two billion, three hundred thirty-one million, two hundred twenty thousand, three hundred twenty".