23121567773 has 2 divisors, whose sum is σ = 23121567774. Its totient is φ = 23121567772.

The previous prime is 23121567751. The next prime is 23121567851. The reversal of 23121567773 is 37776512132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12432696004 + 10688871769 = 111502^2 + 103387^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121567773 - 2⁶ = 23121567709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23121567173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560783886 + 11560783887.

It is an arithmetic number, because the mean of its divisors is an integer number (11560783887).

Almost surely, 2^23121567773 is an apocalyptic number.

It is an amenable number.

23121567773 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121567773 is an equidigital number, since it uses as much as digits as its factorization.

23121567773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370440, while the sum is 44.

The spelling of 23121567773 in words is "twenty-three billion, one hundred twenty-one million, five hundred sixty-seven thousand, seven hundred seventy-three".