21150297 has 12 divisors (see below), whose sum is σ = 34914880. Its totient is φ = 12085848.

The previous prime is 21150293. The next prime is 21150313. The reversal of 21150297 is 79205112.

It is not a de Polignac number, because 21150297 - 2² = 21150293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21150297.

It is not an unprimeable number, because it can be changed into a prime (21150293) 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, 167797 + ... + 167922.

Almost surely, 2^21150297 is an apocalyptic number.

It is an amenable number.

21150297 is a deficient number, since it is larger than the sum of its proper divisors (13764583).

21150297 is a wasteful number, since it uses less digits than its factorization.

21150297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335732 (or 335729 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 21150297 is about 4598.9452051530. The cubic root of 21150297 is about 276.5490409806.

The spelling of 21150297 in words is "twenty-one million, one hundred fifty thousand, two hundred ninety-seven".