21517612375677 has 48 divisors (see below), whose sum is σ = 32116929546240. Its totient is φ = 12801164933920.

The previous prime is 21517612375669. The next prime is 21517612375697. The reversal of 21517612375677 is 77657321671512.

It is a happy number.

It is not a de Polignac number, because 21517612375677 - 2³ = 21517612375669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21517612375677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21517612375697) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13892308 + ... + 15363314.

It is an arithmetic number, because the mean of its divisors is an integer number (669102698880).

Almost surely, 2^{21517612375677} is an apocalyptic number.

It is an amenable number.

21517612375677 is a deficient number, since it is larger than the sum of its proper divisors (10599317170563).

21517612375677 is a wasteful number, since it uses less digits than its factorization.

21517612375677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471774 (or 1471763 counting only the distinct ones).

The product of its digits is 25930800, while the sum is 60.

The spelling of 21517612375677 in words is "twenty-one trillion, five hundred seventeen billion, six hundred twelve million, three hundred seventy-five thousand, six hundred seventy-seven".