21342368 has 24 divisors (see below), whose sum is σ = 42123060. Its totient is φ = 10644480.

The previous prime is 21342359. The next prime is 21342379. The reversal of 21342368 is 86324312.

It can be written as a sum of positive squares in 2 ways, for example, as 21270544 + 71824 = 4612^2 + 268^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21342368.

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, 20648 + ... + 21656.

Almost surely, 2^21342368 is an apocalyptic number.

It is an amenable number.

21342368 is a deficient number, since it is larger than the sum of its proper divisors (20780692).

21342368 is a wasteful number, since it uses less digits than its factorization.

21342368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680 (or 1672 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 21342368 is about 4619.7800813459. The cubic root of 21342368 is about 277.3836560146.

The spelling of 21342368 in words is "twenty-one million, three hundred forty-two thousand, three hundred sixty-eight".