23335667921 has 2 divisors, whose sum is σ = 23335667922. Its totient is φ = 23335667920.

The previous prime is 23335667843. The next prime is 23335667923. The reversal of 23335667921 is 12976653332.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17203994896 + 6131673025 = 131164^2 + 78305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23335667921 is a prime.

Together with 23335667923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23335667923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11667833960 + 11667833961.

It is an arithmetic number, because the mean of its divisors is an integer number (11667833961).

Almost surely, 2^23335667921 is an apocalyptic number.

It is an amenable number.

23335667921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23335667921 is an equidigital number, since it uses as much as digits as its factorization.

23335667921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 47.

The spelling of 23335667921 in words is "twenty-three billion, three hundred thirty-five million, six hundred sixty-seven thousand, nine hundred twenty-one".