21331310320 has 40 divisors (see below), whose sum is σ = 52512670224. Its totient is φ = 8030610432.

The previous prime is 21331310261. The next prime is 21331310321. The reversal of 21331310320 is 2301313312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331310321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7841034 + ... + 7843753.

Almost surely, 2^21331310320 is an apocalyptic number.

21331310320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331310320 is an abundant number, since it is smaller than the sum of its proper divisors (31181359904).

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

21331310320 is a wasteful number, since it uses less digits than its factorization.

21331310320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15684817 (or 15684811 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21331310320 its reverse (2301313312), we get a palindrome (23632623632).

The spelling of 21331310320 in words is "twenty-one billion, three hundred thirty-one million, three hundred ten thousand, three hundred twenty".