21462368 has 24 divisors (see below), whose sum is σ = 43398432. Its totient is φ = 10440576.

The previous prime is 21462367. The next prime is 21462379. The reversal of 21462368 is 86326412.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21462361) 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 3 ways as a sum of consecutive naturals, for example, 7880 + ... + 10247.

It is an arithmetic number, because the mean of its divisors is an integer number (1808268).

Almost surely, 2^21462368 is an apocalyptic number.

It is an amenable number.

21462368 is an abundant number, since it is smaller than the sum of its proper divisors (21936064).

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

21462368 is a wasteful number, since it uses less digits than its factorization.

21462368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18174 (or 18166 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 21462368 is about 4632.7495075819. The cubic root of 21462368 is about 277.9025588836.

The spelling of 21462368 in words is "twenty-one million, four hundred sixty-two thousand, three hundred sixty-eight".