21547032939 has 8 divisors (see below), whose sum is σ = 31921530320. Its totient is φ = 14364688608.

The previous prime is 21547032911. The next prime is 21547032943. The reversal of 21547032939 is 93923074512.

It is not a de Polignac number, because 21547032939 - 2⁵ = 21547032907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21547032894 and 21547032903.

It is not an unprimeable number, because it can be changed into a prime (21547032139) 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, 399019102 + ... + 399019155.

It is an arithmetic number, because the mean of its divisors is an integer number (3990191290).

Almost surely, 2^21547032939 is an apocalyptic number.

21547032939 is a deficient number, since it is larger than the sum of its proper divisors (10374497381).

21547032939 is an equidigital number, since it uses as much as digits as its factorization.

21547032939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798038266 (or 798038260 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 21547032939 in words is "twenty-one billion, five hundred forty-seven million, thirty-two thousand, nine hundred thirty-nine".