21715947384054 has 64 divisors (see below), whose sum is σ = 54373540142592. Its totient is φ = 5617101196800.

The previous prime is 21715947384037. The next prime is 21715947384073. The reversal of 21715947384054 is 45048374951712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97407777 + ... + 97630460.

It is an arithmetic number, because the mean of its divisors is an integer number (849586564728).

Almost surely, 2^{21715947384054} is an apocalyptic number.

21715947384054 is an abundant number, since it is smaller than the sum of its proper divisors (32657592758538).

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

21715947384054 is a wasteful number, since it uses less digits than its factorization.

21715947384054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195038501.

The product of its (nonzero) digits is 33868800, while the sum is 60.

The spelling of 21715947384054 in words is "twenty-one trillion, seven hundred fifteen billion, nine hundred forty-seven million, three hundred eighty-four thousand, fifty-four".