21715617747407 has 16 divisors (see below), whose sum is σ = 22537325508000. Its totient is φ = 20898776231424.

The previous prime is 21715617747323. The next prime is 21715617747413. The reversal of 21715617747407 is 70474771651712.

It is not a de Polignac number, because 21715617747407 - 2⁸ = 21715617747151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21715617747907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232133819 + ... + 232227347.

It is an arithmetic number, because the mean of its divisors is an integer number (1408582844250).

Almost surely, 2^{21715617747407} is an apocalyptic number.

21715617747407 is a deficient number, since it is larger than the sum of its proper divisors (821707760593).

21715617747407 is a wasteful number, since it uses less digits than its factorization.

21715617747407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119450.

The product of its (nonzero) digits is 16134720, while the sum is 59.

The spelling of 21715617747407 in words is "twenty-one trillion, seven hundred fifteen billion, six hundred seventeen million, seven hundred forty-seven thousand, four hundred seven".