21371930924 has 12 divisors (see below), whose sum is σ = 39027004464. Its totient is φ = 10221358224.

The previous prime is 21371930917. The next prime is 21371930927. The reversal of 21371930924 is 42903917312.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21371930927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116151707 + ... + 116151890.

It is an arithmetic number, because the mean of its divisors is an integer number (3252250372).

Almost surely, 2^21371930924 is an apocalyptic number.

It is an amenable number.

21371930924 is a deficient number, since it is larger than the sum of its proper divisors (17655073540).

21371930924 is a wasteful number, since it uses less digits than its factorization.

21371930924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232303624 (or 232303622 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The spelling of 21371930924 in words is "twenty-one billion, three hundred seventy-one million, nine hundred thirty thousand, nine hundred twenty-four".