21930164901 has 24 divisors (see below), whose sum is σ = 31748910336. Its totient is φ = 14586925920.

The previous prime is 21930164899. The next prime is 21930164929. The reversal of 21930164901 is 10946103912.

It is a happy number.

21930164901 is a `hidden beast` number, since 2 + 1 + 9 + 3 + 0 + 1 + 649 + 0 + 1 = 666.

It is not a de Polignac number, because 21930164901 - 2¹ = 21930164899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930166901) 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, 13852756 + ... + 13854338.

It is an arithmetic number, because the mean of its divisors is an integer number (1322871264).

Almost surely, 2^21930164901 is an apocalyptic number.

It is an amenable number.

21930164901 is a deficient number, since it is larger than the sum of its proper divisors (9818745435).

21930164901 is a wasteful number, since it uses less digits than its factorization.

21930164901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113 (or 4110 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The spelling of 21930164901 in words is "twenty-one billion, nine hundred thirty million, one hundred sixty-four thousand, nine hundred one".