4640137908021 has 96 divisors (see below), whose sum is σ = 8741544364800. Its totient is φ = 2301191101440.

The previous prime is 4640137908017. The next prime is 4640137908041. The reversal of 4640137908021 is 1208097310464.

4640137908021 is a `hidden beast` number, since 464 + 0 + 1 + 3 + 7 + 90 + 80 + 21 = 666.

It is not a de Polignac number, because 4640137908021 - 2² = 4640137908017 is a prime.

It is a super-2 number, since 2×4640137908021² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4640137908041) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 491515 + ... + 3085751.

It is an arithmetic number, because the mean of its divisors is an integer number (91057753800).

Almost surely, 2^{4640137908021} is an apocalyptic number.

It is an amenable number.

4640137908021 is a deficient number, since it is larger than the sum of its proper divisors (4101406456779).

4640137908021 is a wasteful number, since it uses less digits than its factorization.

4640137908021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594379 (or 2594376 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 4640137908021 in words is "four trillion, six hundred forty billion, one hundred thirty-seven million, nine hundred eight thousand, twenty-one".