21368363 has 2 divisors, whose sum is σ = 21368364. Its totient is φ = 21368362.

The previous prime is 21368353. The next prime is 21368387. The reversal of 21368363 is 36386312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21368363 - 2⁶ = 21368299 is a prime.

It is not a weakly prime, because it can be changed into another prime (21368353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10684181 + 10684182.

It is an arithmetic number, because the mean of its divisors is an integer number (10684182).

Almost surely, 2^21368363 is an apocalyptic number.

21368363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21368363 is an equidigital number, since it uses as much as digits as its factorization.

21368363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The square root of 21368363 is about 4622.5926707855. The cubic root of 21368363 is about 277.4962280687.

The spelling of 21368363 in words is "twenty-one million, three hundred sixty-eight thousand, three hundred sixty-three".