23121586613 has 2 divisors, whose sum is σ = 23121586614. Its totient is φ = 23121586612.

The previous prime is 23121586589. The next prime is 23121586637. The reversal of 23121586613 is 31668512132.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (23121586589) and next prime (23121586637).

It can be written as a sum of positive squares in only one way, i.e., 19914289924 + 3207296689 = 141118^2 + 56633^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121586613 - 2⁸ = 23121586357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23121586673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560793306 + 11560793307.

It is an arithmetic number, because the mean of its divisors is an integer number (11560793307).

Almost surely, 2^23121586613 is an apocalyptic number.

It is an amenable number.

23121586613 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121586613 is an equidigital number, since it uses as much as digits as its factorization.

23121586613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The spelling of 23121586613 in words is "twenty-three billion, one hundred twenty-one million, five hundred eighty-six thousand, six hundred thirteen".