21717264621516 has 24 divisors (see below), whose sum is σ = 50681170718640. Its totient is φ = 7238009168832.

The previous prime is 21717264621443. The next prime is 21717264621527. The reversal of 21717264621516 is 61512646271712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134795931 + ... + 134956946.

It is an arithmetic number, because the mean of its divisors is an integer number (2111715446610).

Almost surely, 2^{21717264621516} is an apocalyptic number.

It is an amenable number.

21717264621516 is an abundant number, since it is smaller than the sum of its proper divisors (28963906097124).

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

21717264621516 is a wasteful number, since it uses less digits than its factorization.

21717264621516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269759593 (or 269759591 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 51.

The spelling of 21717264621516 in words is "twenty-one trillion, seven hundred seventeen billion, two hundred sixty-four million, six hundred twenty-one thousand, five hundred sixteen".