21884663 has 2 divisors, whose sum is σ = 21884664. Its totient is φ = 21884662.

The previous prime is 21884651. The next prime is 21884671. The reversal of 21884663 is 36648812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21884663 - 2¹⁰ = 21883639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21884633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942331 + 10942332.

It is an arithmetic number, because the mean of its divisors is an integer number (10942332).

Almost surely, 2^21884663 is an apocalyptic number.

21884663 is a deficient number, since it is larger than the sum of its proper divisors (1).

21884663 is an equidigital number, since it uses as much as digits as its factorization.

21884663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 21884663 is about 4678.1046375642. The cubic root of 21884663 is about 279.7134099963.

The spelling of 21884663 in words is "twenty-one million, eight hundred eighty-four thousand, six hundred sixty-three".