21152898 has 24 divisors (see below), whose sum is σ = 49357308. Its totient is φ = 6508512.

The previous prime is 21152869. The next prime is 21152917. The reversal of 21152898 is 89825112.

It can be written as a sum of positive squares in 2 ways, for example, as 15233409 + 5919489 = 3903^2 + 2433^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44965 + ... + 45432.

Almost surely, 2^21152898 is an apocalyptic number.

21152898 is an abundant number, since it is smaller than the sum of its proper divisors (28204410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21152898 is a wasteful number, since it uses less digits than its factorization.

21152898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90418 (or 90415 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 21152898 is about 4599.2279786938. The cubic root of 21152898 is about 276.5603769060.

The spelling of 21152898 in words is "twenty-one million, one hundred fifty-two thousand, eight hundred ninety-eight".