21031220012320 has 192 divisors, whose sum is σ = 61351580908800. Its totient is φ = 6786544644096.

The previous prime is 21031220012317. The next prime is 21031220012339. The reversal of 21031220012320 is 2321002213012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10338274 + ... + 12204193.

It is an arithmetic number, because the mean of its divisors is an integer number (319539483900).

Almost surely, 2^{21031220012320} is an apocalyptic number.

21031220012320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031220012320 is an abundant number, since it is smaller than the sum of its proper divisors (40320360896480).

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

21031220012320 is a wasteful number, since it uses less digits than its factorization.

21031220012320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22542520 (or 22542498 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21031220012320 its reverse (2321002213012), we get a palindrome (23352222225332).

The spelling of 21031220012320 in words is "twenty-one trillion, thirty-one billion, two hundred twenty million, twelve thousand, three hundred twenty".