21731025611 has 2 divisors, whose sum is σ = 21731025612. Its totient is φ = 21731025610.

The previous prime is 21731025599. The next prime is 21731025653. The reversal of 21731025611 is 11652013712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21731025611 - 2³⁴ = 4551156427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21731027611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10865512805 + 10865512806.

It is an arithmetic number, because the mean of its divisors is an integer number (10865512806).

Almost surely, 2^21731025611 is an apocalyptic number.

21731025611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21731025611 is an equidigital number, since it uses as much as digits as its factorization.

21731025611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The spelling of 21731025611 in words is "twenty-one billion, seven hundred thirty-one million, twenty-five thousand, six hundred eleven".