21371907432 has 16 divisors (see below), whose sum is σ = 53429768640. Its totient is φ = 7123969136.

The previous prime is 21371907419. The next prime is 21371907437. The reversal of 21371907432 is 23470917312.

It is not an unprimeable number, because it can be changed into a prime (21371907437) 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, 445248048 + ... + 445248095.

It is an arithmetic number, because the mean of its divisors is an integer number (3339360540).

Almost surely, 2^21371907432 is an apocalyptic number.

It is an amenable number.

21371907432 is an abundant number, since it is smaller than the sum of its proper divisors (32057861208).

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

21371907432 is a wasteful number, since it uses less digits than its factorization.

21371907432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890496152 (or 890496148 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 39.

The spelling of 21371907432 in words is "twenty-one billion, three hundred seventy-one million, nine hundred seven thousand, four hundred thirty-two".