21374267156715 has 16 divisors (see below), whose sum is σ = 37307811764736. Its totient is φ = 10363281045600.

The previous prime is 21374267156713. The next prime is 21374267156743. The reversal of 21374267156715 is 51765176247312.

It is not a de Polignac number, because 21374267156715 - 2¹ = 21374267156713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21374267156713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64770506371 + ... + 64770506700.

It is an arithmetic number, because the mean of its divisors is an integer number (2331738235296).

Almost surely, 2^{21374267156715} is an apocalyptic number.

21374267156715 is a deficient number, since it is larger than the sum of its proper divisors (15933544608021).

21374267156715 is a wasteful number, since it uses less digits than its factorization.

21374267156715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129541013090.

The product of its digits is 14817600, while the sum is 57.

The spelling of 21374267156715 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred sixty-seven million, one hundred fifty-six thousand, seven hundred fifteen".