21096351 has 12 divisors (see below), whose sum is σ = 30714112. Its totient is φ = 13952736.

The previous prime is 21096349. The next prime is 21096367. The reversal of 21096351 is 15369012.

21096351 is a `hidden beast` number, since 21 + 0 + 9 + 635 + 1 = 666.

It is not a de Polignac number, because 21096351 - 2¹ = 21096349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096331) 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, 8086 + ... + 10371.

Almost surely, 2^21096351 is an apocalyptic number.

21096351 is a deficient number, since it is larger than the sum of its proper divisors (9617761).

21096351 is a wasteful number, since it uses less digits than its factorization.

21096351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18590 (or 18587 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 21096351 is about 4593.0764200044. The cubic root of 21096351 is about 276.3137185724.

The spelling of 21096351 in words is "twenty-one million, ninety-six thousand, three hundred fifty-one".