21357137307 has 24 divisors (see below), whose sum is σ = 31430272720. Its totient is φ = 12889958400.

The previous prime is 21357137257. The next prime is 21357137311. The reversal of 21357137307 is 70373175312.

It is not a de Polignac number, because 21357137307 - 2²⁶ = 21290028443 is a prime.

It is a super-2 number, since 2×21357137307² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21357137317) 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, 34582 + ... + 209547.

Almost surely, 2^21357137307 is an apocalyptic number.

21357137307 is a deficient number, since it is larger than the sum of its proper divisors (10073135413).

21357137307 is a wasteful number, since it uses less digits than its factorization.

21357137307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244395 (or 244384 counting only the distinct ones).

The product of its (nonzero) digits is 92610, while the sum is 39.

The spelling of 21357137307 in words is "twenty-one billion, three hundred fifty-seven million, one hundred thirty-seven thousand, three hundred seven".