21300885 has 12 divisors (see below), whose sum is σ = 36921612. Its totient is φ = 11360448.

The previous prime is 21300869. The next prime is 21300901. The reversal of 21300885 is 58800312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21300869) and next prime (21300901).

It can be written as a sum of positive squares in 2 ways, for example, as 16966161 + 4334724 = 4119^2 + 2082^2 .

It is not a de Polignac number, because 21300885 - 2⁴ = 21300869 is a prime.

It is a congruent number.

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, 236632 + ... + 236721.

It is an arithmetic number, because the mean of its divisors is an integer number (3076801).

Almost surely, 2^21300885 is an apocalyptic number.

It is an amenable number.

21300885 is a deficient number, since it is larger than the sum of its proper divisors (15620727).

21300885 is a wasteful number, since it uses less digits than its factorization.

21300885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473364 (or 473361 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21300885 is about 4615.2881816849. The cubic root of 21300885 is about 277.2038232764.

The spelling of 21300885 in words is "twenty-one million, three hundred thousand, eight hundred eighty-five".