21331213403320 has 64 divisors (see below), whose sum is σ = 50760732700800. Its totient is φ = 8045097137280.

The previous prime is 21331213403273. The next prime is 21331213403341. The reversal of 21331213403320 is 2330431213312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66350034 + ... + 66670753.

It is an arithmetic number, because the mean of its divisors is an integer number (793136448450).

Almost surely, 2^{21331213403320} is an apocalyptic number.

21331213403320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331213403320 is an abundant number, since it is smaller than the sum of its proper divisors (29429519297480).

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

21331213403320 is a wasteful number, since it uses less digits than its factorization.

21331213403320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133021028 (or 133021024 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 21331213403320 its reverse (2330431213312), we get a palindrome (23661644616632).

The spelling of 21331213403320 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred thirteen million, four hundred three thousand, three hundred twenty".