21468879 has 24 divisors (see below), whose sum is σ = 32847360. Its totient is φ = 13474512.

The previous prime is 21468829. The next prime is 21468899. The reversal of 21468879 is 97886412.

It is not a de Polignac number, because 21468879 - 2⁷ = 21468751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21468809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37852 + ... + 38414.

It is an arithmetic number, because the mean of its divisors is an integer number (1368640).

Almost surely, 2^21468879 is an apocalyptic number.

21468879 is a deficient number, since it is larger than the sum of its proper divisors (11378481).

21468879 is a wasteful number, since it uses less digits than its factorization.

21468879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 808 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 21468879 is about 4633.4521687398. The cubic root of 21468879 is about 277.9306583089.

It can be divided in two parts, 2146 and 8879, that added together give a square (11025 = 105²).

The spelling of 21468879 in words is "twenty-one million, four hundred sixty-eight thousand, eight hundred seventy-nine".