21486830 has 32 divisors (see below), whose sum is σ = 40794624. Its totient is φ = 8132256.

The previous prime is 21486821. The next prime is 21486859. The reversal of 21486830 is 3868412.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23237 + ... + 24143.

It is an arithmetic number, because the mean of its divisors is an integer number (1274832).

Almost surely, 2^21486830 is an apocalyptic number.

21486830 is a deficient number, since it is larger than the sum of its proper divisors (19307794).

21486830 is a wasteful number, since it uses less digits than its factorization.

21486830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21486830 is about 4635.3888725758. The cubic root of 21486830 is about 278.0080997588.

The spelling of 21486830 in words is "twenty-one million, four hundred eighty-six thousand, eight hundred thirty".