21332319920 has 40 divisors (see below), whose sum is σ = 52208049840. Its totient is φ = 8083825920.

The previous prime is 21332319889. The next prime is 21332319941. The reversal of 21332319920 is 2991323312.

It is a happy number.

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

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, 7015691 + ... + 7018730.

It is an arithmetic number, because the mean of its divisors is an integer number (1305201246).

Almost surely, 2^21332319920 is an apocalyptic number.

21332319920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21332319920 is an abundant number, since it is smaller than the sum of its proper divisors (30875729920).

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

21332319920 is a wasteful number, since it uses less digits than its factorization.

21332319920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14034453 (or 14034447 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 21332319920 in words is "twenty-one billion, three hundred thirty-two million, three hundred nineteen thousand, nine hundred twenty".