21486858 has 16 divisors (see below), whose sum is σ = 43417920. Its totient is φ = 7088256.

The previous prime is 21486821. The next prime is 21486859. The reversal of 21486858 is 85868412.

It is not an unprimeable number, because it can be changed into a prime (21486859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17878 + ... + 19041.

It is an arithmetic number, because the mean of its divisors is an integer number (2713620).

Almost surely, 2^21486858 is an apocalyptic number.

21486858 is an abundant number, since it is smaller than the sum of its proper divisors (21931062).

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

21486858 is a wasteful number, since it uses less digits than its factorization.

21486858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37021.

The product of its digits is 122880, while the sum is 42.

The square root of 21486858 is about 4635.3918928177. The cubic root of 21486858 is about 278.0082205184.

The spelling of 21486858 in words is "twenty-one million, four hundred eighty-six thousand, eight hundred fifty-eight".