21868063 has 12 divisors (see below), whose sum is σ = 25821912. Its totient is φ = 18461520.

The previous prime is 21868043. The next prime is 21868081. The reversal of 21868063 is 36086812.

It is not a de Polignac number, because 21868063 - 2⁹ = 21867551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (2151826).

Almost surely, 2^21868063 is an apocalyptic number.

21868063 is a deficient number, since it is larger than the sum of its proper divisors (3953849).

21868063 is an equidigital number, since it uses as much as digits as its factorization.

21868063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6742 (or 6735 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 21868063 is about 4676.3300781703. The cubic root of 21868063 is about 279.6426691750.

The spelling of 21868063 in words is "twenty-one million, eight hundred sixty-eight thousand, sixty-three".