21064714106172 has 36 divisors (see below), whose sum is σ = 54025478882088. Its totient is φ = 6383246698400.

The previous prime is 21064714106171. The next prime is 21064714106197. The reversal of 21064714106172 is 27160141746012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064714106171) 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, 7253687979 + ... + 7253690882.

Almost surely, 2^{21064714106172} is an apocalyptic number.

21064714106172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21064714106172 is an abundant number, since it is smaller than the sum of its proper divisors (32960764775916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21064714106172 is a wasteful number, since it uses less digits than its factorization.

21064714106172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14507378890 (or 14507378877 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 21064714106172 in words is "twenty-one trillion, sixty-four billion, seven hundred fourteen million, one hundred six thousand, one hundred seventy-two".