21330313320 has 32 divisors (see below), whose sum is σ = 63990940320. Its totient is φ = 5688083520.

The previous prime is 21330313283. The next prime is 21330313351. The reversal of 21330313320 is 2331303312.

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, 88876186 + ... + 88876425.

It is an arithmetic number, because the mean of its divisors is an integer number (1999716885).

Almost surely, 2^21330313320 is an apocalyptic number.

21330313320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330313320 is an abundant number, since it is smaller than the sum of its proper divisors (42660627000).

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

21330313320 is a wasteful number, since it uses less digits than its factorization.

21330313320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177752625 (or 177752621 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21330313320 its reverse (2331303312), we get a palindrome (23661616632).

The spelling of 21330313320 in words is "twenty-one billion, three hundred thirty million, three hundred thirteen thousand, three hundred twenty".