921682135917 has 12 divisors (see below), whose sum is σ = 1359644569920. Its totient is φ = 601381251528.

The previous prime is 921682135873. The next prime is 921682135937. The reversal of 921682135917 is 719531286129.

It is a happy number.

921682135917 is a `hidden beast` number, since 9 + 21 + 6 + 8 + 21 + 3 + 591 + 7 = 666.

921682135917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 921682135917 - 2²⁴ = 921665358701 is a prime.

It is a super-2 number, since 2×921682135917² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921682135937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1089458367 + ... + 1089459212.

It is an arithmetic number, because the mean of its divisors is an integer number (113303714160).

Almost surely, 2^921682135917 is an apocalyptic number.

It is an amenable number.

921682135917 is a deficient number, since it is larger than the sum of its proper divisors (437962434003).

921682135917 is a wasteful number, since it uses less digits than its factorization.

921682135917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178917632 (or 2178917629 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The spelling of 921682135917 in words is "nine hundred twenty-one billion, six hundred eighty-two million, one hundred thirty-five thousand, nine hundred seventeen".