21713335938 has 48 divisors (see below), whose sum is σ = 55620377280. Its totient is φ = 5989884768.

The previous prime is 21713335933. The next prime is 21713335951. The reversal of 21713335938 is 83953331712.

21713335938 is a `hidden beast` number, since 2 + 17 + 13 + 33 + 593 + 8 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21713335893 and 21713335902.

It is not an unprimeable number, because it can be changed into a prime (21713335933) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2967520 + ... + 2974827.

It is an arithmetic number, because the mean of its divisors is an integer number (1158757860).

Almost surely, 2^21713335938 is an apocalyptic number.

21713335938 is an abundant number, since it is smaller than the sum of its proper divisors (33907041342).

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

21713335938 is a wasteful number, since it uses less digits than its factorization.

21713335938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5942391 (or 5942388 counting only the distinct ones).

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

The spelling of 21713335938 in words is "twenty-one billion, seven hundred thirteen million, three hundred thirty-five thousand, nine hundred thirty-eight".