21348936554064 has 120 divisors (see below), whose sum is σ = 64967831256960. Its totient is φ = 6022484762112.

The previous prime is 21348936554059. The next prime is 21348936554123. The reversal of 21348936554064 is 46045563984312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21348936553989 and 21348936554007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57263109 + ... + 57634724.

It is an arithmetic number, because the mean of its divisors is an integer number (541398593808).

Almost surely, 2^{21348936554064} is an apocalyptic number.

21348936554064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21348936554064 is an abundant number, since it is smaller than the sum of its proper divisors (43618894702896).

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

21348936554064 is a wasteful number, since it uses less digits than its factorization.

21348936554064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114897937 (or 114897924 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 60.

The spelling of 21348936554064 in words is "twenty-one trillion, three hundred forty-eight billion, nine hundred thirty-six million, five hundred fifty-four thousand, sixty-four".