21930646131 has 16 divisors (see below), whose sum is σ = 32745676800. Its totient is φ = 14505306984.

The previous prime is 21930646121. The next prime is 21930646139. The reversal of 21930646131 is 13164603912.

21930646131 is a `hidden beast` number, since 2 + 1 + 9 + 3 + 0 + 646 + 1 + 3 + 1 = 666.

It is not a de Polignac number, because 21930646131 - 2⁵ = 21930646099 is a prime.

It is a super-2 number, since 2×21930646131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21930646139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3194391 + ... + 3201248.

It is an arithmetic number, because the mean of its divisors is an integer number (2046604800).

Almost surely, 2^21930646131 is an apocalyptic number.

21930646131 is a deficient number, since it is larger than the sum of its proper divisors (10815030669).

21930646131 is a wasteful number, since it uses less digits than its factorization.

21930646131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6395775 (or 6395769 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The spelling of 21930646131 in words is "twenty-one billion, nine hundred thirty million, six hundred forty-six thousand, one hundred thirty-one".