15135921 has 12 divisors (see below), whose sum is σ = 21914880. Its totient is φ = 10066680.

The previous prime is 15135917. The next prime is 15135931. The reversal of 15135921 is 12953151.

It is not a de Polignac number, because 15135921 - 2² = 15135917 is a prime.

It is a super-2 number, since 2×15135921² = 458192209036482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15135931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2556 + ... + 6066.

It is an arithmetic number, because the mean of its divisors is an integer number (1826240).

Almost surely, 2^15135921 is an apocalyptic number.

It is an amenable number.

15135921 is a deficient number, since it is larger than the sum of its proper divisors (6778959).

15135921 is a wasteful number, since it uses less digits than its factorization.

15135921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996 (or 3993 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 15135921 is about 3890.4911001055. The cubic root of 15135921 is about 247.3638798488.

The spelling of 15135921 in words is "fifteen million, one hundred thirty-five thousand, nine hundred twenty-one".