21150897 has 16 divisors (see below), whose sum is σ = 29233152. Its totient is φ = 13588560.

The previous prime is 21150887. The next prime is 21150911. The reversal of 21150897 is 79805112.

It is not a de Polignac number, because 21150897 - 2¹⁰ = 21149873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21150817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43188 + ... + 43674.

It is an arithmetic number, because the mean of its divisors is an integer number (1827072).

Almost surely, 2^21150897 is an apocalyptic number.

It is an amenable number.

21150897 is a deficient number, since it is larger than the sum of its proper divisors (8082255).

21150897 is a wasteful number, since it uses less digits than its factorization.

21150897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 21150897 is about 4599.0104370397. The cubic root of 21150897 is about 276.5516560401.

The spelling of 21150897 in words is "twenty-one million, one hundred fifty thousand, eight hundred ninety-seven".