21731025607 has 4 divisors (see below), whose sum is σ = 21739237936. Its totient is φ = 21722813280.

The previous prime is 21731025599. The next prime is 21731025611. The reversal of 21731025607 is 70652013712.

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

It is a cyclic number.

It is not a de Polignac number, because 21731025607 - 2³ = 21731025599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21731025007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4102194 + ... + 4107487.

It is an arithmetic number, because the mean of its divisors is an integer number (5434809484).

Almost surely, 2^21731025607 is an apocalyptic number.

21731025607 is a deficient number, since it is larger than the sum of its proper divisors (8212329).

21731025607 is an equidigital number, since it uses as much as digits as its factorization.

21731025607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8212328.

The product of its (nonzero) digits is 17640, while the sum is 34.

The spelling of 21731025607 in words is "twenty-one billion, seven hundred thirty-one million, twenty-five thousand, six hundred seven".