21715031234667 has 16 divisors (see below), whose sum is σ = 29391561385472. Its totient is φ = 14257683205920.

The previous prime is 21715031234657. The next prime is 21715031234669. The reversal of 21715031234667 is 76643213051712.

It is not a de Polignac number, because 21715031234667 - 2¹¹ = 21715031232619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21715031234669) 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, 10135363 + ... + 12089484.

It is an arithmetic number, because the mean of its divisors is an integer number (1836972586592).

Almost surely, 2^{21715031234667} is an apocalyptic number.

21715031234667 is a deficient number, since it is larger than the sum of its proper divisors (7676530150805).

21715031234667 is a wasteful number, since it uses less digits than its factorization.

21715031234667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22229778.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 21715031234667 in words is "twenty-one trillion, seven hundred fifteen billion, thirty-one million, two hundred thirty-four thousand, six hundred sixty-seven".