21314715745 has 4 divisors (see below), whose sum is σ = 25577658900. Its totient is φ = 17051772592.

The previous prime is 21314715727. The next prime is 21314715769. The reversal of 21314715745 is 54751741312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10470200976 + 10844514769 = 102324^2 + 104137^2 .

It is a cyclic number.

It is not a de Polignac number, because 21314715745 - 2¹¹ = 21314713697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21314715698 and 21314715707.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131471570 + ... + 2131471579.

It is an arithmetic number, because the mean of its divisors is an integer number (6394414725).

Almost surely, 2^21314715745 is an apocalyptic number.

It is an amenable number.

21314715745 is a deficient number, since it is larger than the sum of its proper divisors (4262943155).

21314715745 is an equidigital number, since it uses as much as digits as its factorization.

21314715745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262943154.

The product of its digits is 117600, while the sum is 40.

The spelling of 21314715745 in words is "twenty-one billion, three hundred fourteen million, seven hundred fifteen thousand, seven hundred forty-five".