21429368 has 16 divisors (see below), whose sum is σ = 41035680. Its totient is φ = 10486528.

The previous prime is 21429349. The next prime is 21429377. The reversal of 21429368 is 86392412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28121 + ... + 28872.

It is an arithmetic number, because the mean of its divisors is an integer number (2564730).

Almost surely, 2^21429368 is an apocalyptic number.

It is an amenable number.

21429368 is a deficient number, since it is larger than the sum of its proper divisors (19606312).

21429368 is a wasteful number, since it uses less digits than its factorization.

21429368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57046 (or 57042 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 21429368 is about 4629.1865376111. The cubic root of 21429368 is about 277.7600538143.

The spelling of 21429368 in words is "twenty-one million, four hundred twenty-nine thousand, three hundred sixty-eight".