21274113745 has 16 divisors (see below), whose sum is σ = 25596370512. Its totient is φ = 16974397440.

The previous prime is 21274113727. The next prime is 21274113761. The reversal of 21274113745 is 54731147212.

It can be written as a sum of positive squares in 8 ways, for example, as 9532007424 + 11742106321 = 97632^2 + 108361^2 .

It is not a de Polignac number, because 21274113745 - 2⁷ = 21274113617 is a prime.

It is a Duffinian number.

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, 3500029 + ... + 3506101.

It is an arithmetic number, because the mean of its divisors is an integer number (1599773157).

Almost surely, 2^21274113745 is an apocalyptic number.

It is an amenable number.

21274113745 is a deficient number, since it is larger than the sum of its proper divisors (4322256767).

21274113745 is a wasteful number, since it uses less digits than its factorization.

21274113745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7812.

The product of its digits is 47040, while the sum is 37.

The spelling of 21274113745 in words is "twenty-one billion, two hundred seventy-four million, one hundred thirteen thousand, seven hundred forty-five".