21365338 has 8 divisors (see below), whose sum is σ = 32365620. Its totient is φ = 10576800.

The previous prime is 21365303. The next prime is 21365347. The reversal of 21365338 is 83356312.

It can be written as a sum of positive squares in 2 ways, for example, as 13564489 + 7800849 = 3683^2 + 2793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 52683 + ... + 53086.

Almost surely, 2^21365338 is an apocalyptic number.

21365338 is a deficient number, since it is larger than the sum of its proper divisors (11000282).

21365338 is a wasteful number, since it uses less digits than its factorization.

21365338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105872.

The product of its digits is 12960, while the sum is 31.

The square root of 21365338 is about 4622.2654618704. The cubic root of 21365338 is about 277.4831329196.

The spelling of 21365338 in words is "twenty-one million, three hundred sixty-five thousand, three hundred thirty-eight".