21139130646172 has 24 divisors (see below), whose sum is σ = 46121739592320. Its totient is φ = 8236024926960.

The previous prime is 21139130646121. The next prime is 21139130646197. The reversal of 21139130646172 is 27164603193112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34316770222 + ... + 34316770837.

It is an arithmetic number, because the mean of its divisors is an integer number (1921739149680).

Almost surely, 2^{21139130646172} is an apocalyptic number.

21139130646172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21139130646172 is an abundant number, since it is smaller than the sum of its proper divisors (24982608946148).

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

21139130646172 is a wasteful number, since it uses less digits than its factorization.

21139130646172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68633541081 (or 68633541079 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 21139130646172 in words is "twenty-one trillion, one hundred thirty-nine billion, one hundred thirty million, six hundred forty-six thousand, one hundred seventy-two".