21300858 has 12 divisors (see below), whose sum is σ = 46151898. Its totient is φ = 7100280.

The previous prime is 21300833. The next prime is 21300869. The reversal of 21300858 is 85800312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21095649 + 205209 = 4593^2 + 453^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 591673 + ... + 591708.

Almost surely, 2^21300858 is an apocalyptic number.

21300858 is an abundant number, since it is smaller than the sum of its proper divisors (24851040).

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

21300858 is a wasteful number, since it uses less digits than its factorization.

21300858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183389 (or 1183386 counting only the distinct ones).

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

The square root of 21300858 is about 4615.2852566228. The cubic root of 21300858 is about 277.2037061529.

The spelling of 21300858 in words is "twenty-one million, three hundred thousand, eight hundred fifty-eight".