21036337320 has 32 divisors (see below), whose sum is σ = 63109012320. Its totient is φ = 5609689920.

The previous prime is 21036337297. The next prime is 21036337379. The reversal of 21036337320 is 2373363012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 87651286 + ... + 87651525.

It is an arithmetic number, because the mean of its divisors is an integer number (1972156635).

Almost surely, 2^21036337320 is an apocalyptic number.

21036337320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21036337320 is an abundant number, since it is smaller than the sum of its proper divisors (42072675000).

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

21036337320 is a wasteful number, since it uses less digits than its factorization.

21036337320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175302825 (or 175302821 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 30.

The spelling of 21036337320 in words is "twenty-one billion, thirty-six million, three hundred thirty-seven thousand, three hundred twenty".