21139660115184 has 320 divisors, whose sum is σ = 61592242844160. Its totient is φ = 6205452042240.

The previous prime is 21139660115183. The next prime is 21139660115221. The reversal of 21139660115184 is 48151106693112.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21139660115183) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 234790527 + ... + 234880545.

It is an arithmetic number, because the mean of its divisors is an integer number (192475758888).

Almost surely, 2^{21139660115184} is an apocalyptic number.

21139660115184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21139660115184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30796121422080).

21139660115184 is an abundant number, since it is smaller than the sum of its proper divisors (40452582728976).

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

21139660115184 is a wasteful number, since it uses less digits than its factorization.

21139660115184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90288 (or 90282 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 21139660115184 in words is "twenty-one trillion, one hundred thirty-nine billion, six hundred sixty million, one hundred fifteen thousand, one hundred eighty-four".