21713766522 has 32 divisors (see below), whose sum is σ = 49756520832. Its totient is φ = 6188301504.

The previous prime is 21713766509. The next prime is 21713766587. The reversal of 21713766522 is 22566731712.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 634453 + ... + 667800.

It is an arithmetic number, because the mean of its divisors is an integer number (1554891276).

Almost surely, 2^21713766522 is an apocalyptic number.

21713766522 is an abundant number, since it is smaller than the sum of its proper divisors (28042754310).

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

21713766522 is a wasteful number, since it uses less digits than its factorization.

21713766522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302662.

The product of its digits is 211680, while the sum is 42.

The spelling of 21713766522 in words is "twenty-one billion, seven hundred thirteen million, seven hundred sixty-six thousand, five hundred twenty-two".