22791715721 has 2 divisors, whose sum is σ = 22791715722. Its totient is φ = 22791715720.

The previous prime is 22791715711. The next prime is 22791715763. The reversal of 22791715721 is 12751719722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13238803600 + 9552912121 = 115060^2 + 97739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22791715721 is a prime.

It is not a weakly prime, because it can be changed into another prime (22791715711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11395857860 + 11395857861.

It is an arithmetic number, because the mean of its divisors is an integer number (11395857861).

Almost surely, 2^22791715721 is an apocalyptic number.

It is an amenable number.

22791715721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22791715721 is an equidigital number, since it uses as much as digits as its factorization.

22791715721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 44.

The spelling of 22791715721 in words is "twenty-two billion, seven hundred ninety-one million, seven hundred fifteen thousand, seven hundred twenty-one".