21747311713 has 16 divisors (see below), whose sum is σ = 22183200000. Its totient is φ = 21316344192.

The previous prime is 21747311711. The next prime is 21747311731. The reversal of 21747311713 is 31711374712.

It is a cyclic number.

It is not a de Polignac number, because 21747311713 - 2¹ = 21747311711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21747311711) 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, 6970968 + ... + 6974086.

It is an arithmetic number, because the mean of its divisors is an integer number (1386450000).

Almost surely, 2^21747311713 is an apocalyptic number.

It is an amenable number.

21747311713 is a deficient number, since it is larger than the sum of its proper divisors (435888287).

21747311713 is a wasteful number, since it uses less digits than its factorization.

21747311713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3864.

The product of its digits is 24696, while the sum is 37.

The spelling of 21747311713 in words is "twenty-one billion, seven hundred forty-seven million, three hundred eleven thousand, seven hundred thirteen".