21868430 has 32 divisors (see below), whose sum is σ = 41731200. Its totient is φ = 8227872.

The previous prime is 21868421. The next prime is 21868433. The reversal of 21868430 is 3486812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33689 + ... + 34331.

It is an arithmetic number, because the mean of its divisors is an integer number (1304100).

Almost surely, 2^21868430 is an apocalyptic number.

21868430 is a deficient number, since it is larger than the sum of its proper divisors (19862770).

21868430 is a wasteful number, since it uses less digits than its factorization.

21868430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848.

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

The square root of 21868430 is about 4676.3693181784. The cubic root of 21868430 is about 279.6442335307.

The spelling of 21868430 in words is "twenty-one million, eight hundred sixty-eight thousand, four hundred thirty".