23534607721 has 2 divisors, whose sum is σ = 23534607722. Its totient is φ = 23534607720.

The previous prime is 23534607703. The next prime is 23534607731. The reversal of 23534607721 is 12770643532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17507259225 + 6027348496 = 132315^2 + 77636^2 .

It is a cyclic number.

It is not a de Polignac number, because 23534607721 - 2⁹ = 23534607209 is a prime.

It is not a weakly prime, because it can be changed into another prime (23534607731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11767303860 + 11767303861.

It is an arithmetic number, because the mean of its divisors is an integer number (11767303861).

Almost surely, 2^23534607721 is an apocalyptic number.

It is an amenable number.

23534607721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23534607721 is an equidigital number, since it uses as much as digits as its factorization.

23534607721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 40.

The spelling of 23534607721 in words is "twenty-three billion, five hundred thirty-four million, six hundred seven thousand, seven hundred twenty-one".