15933076921 has 2 divisors, whose sum is σ = 15933076922. Its totient is φ = 15933076920.

The previous prime is 15933076919. The next prime is 15933076961. The reversal of 15933076921 is 12967033951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11751644025 + 4181432896 = 108405^2 + 64664^2 .

It is a cyclic number.

It is not a de Polignac number, because 15933076921 - 2¹ = 15933076919 is a prime.

Together with 15933076919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15933076961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7966538460 + 7966538461.

It is an arithmetic number, because the mean of its divisors is an integer number (7966538461).

Almost surely, 2^15933076921 is an apocalyptic number.

It is an amenable number.

15933076921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15933076921 is an equidigital number, since it uses as much as digits as its factorization.

15933076921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 46.

The spelling of 15933076921 in words is "fifteen billion, nine hundred thirty-three million, seventy-six thousand, nine hundred twenty-one".