15268921 has 2 divisors, whose sum is σ = 15268922. Its totient is φ = 15268920.

The previous prime is 15268919. The next prime is 15268931. The reversal of 15268921 is 12986251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 2595321 = 3560^2 + 1611^2 .

It is a cyclic number.

It is not a de Polignac number, because 15268921 - 2¹ = 15268919 is a prime.

Together with 15268919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15268931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7634460 + 7634461.

It is an arithmetic number, because the mean of its divisors is an integer number (7634461).

Almost surely, 2^15268921 is an apocalyptic number.

It is an amenable number.

15268921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15268921 is an equidigital number, since it uses as much as digits as its factorization.

15268921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 15268921 is about 3907.5466727859. The cubic root of 15268921 is about 248.0863003936.

The spelling of 15268921 in words is "fifteen million, two hundred sixty-eight thousand, nine hundred twenty-one".