21902663 has 2 divisors, whose sum is σ = 21902664. Its totient is φ = 21902662.

The previous prime is 21902659. The next prime is 21902689. The reversal of 21902663 is 36620912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21902663 - 2² = 21902659 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21902623) 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 as a sum of consecutive naturals, namely, 10951331 + 10951332.

It is an arithmetic number, because the mean of its divisors is an integer number (10951332).

Almost surely, 2^21902663 is an apocalyptic number.

21902663 is a deficient number, since it is larger than the sum of its proper divisors (1).

21902663 is an equidigital number, since it uses as much as digits as its factorization.

21902663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21902663 is about 4680.0280982062. The cubic root of 21902663 is about 279.7900764976.

The spelling of 21902663 in words is "twenty-one million, nine hundred two thousand, six hundred sixty-three".