21726845745 has 64 divisors (see below), whose sum is σ = 38196707328. Its totient is φ = 10458560000.

The previous prime is 21726845669. The next prime is 21726845753. The reversal of 21726845745 is 54754862712.

It is not a de Polignac number, because 21726845745 - 2¹⁰ = 21726844721 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18875920 + ... + 18877070.

It is an arithmetic number, because the mean of its divisors is an integer number (596823552).

Almost surely, 2^21726845745 is an apocalyptic number.

It is an amenable number.

21726845745 is a deficient number, since it is larger than the sum of its proper divisors (16469861583).

21726845745 is a wasteful number, since it uses less digits than its factorization.

21726845745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894.

The product of its digits is 3763200, while the sum is 51.

The spelling of 21726845745 in words is "twenty-one billion, seven hundred twenty-six million, eight hundred forty-five thousand, seven hundred forty-five".