21864883 has 2 divisors, whose sum is σ = 21864884. Its totient is φ = 21864882.

The previous prime is 21864859. The next prime is 21864893. The reversal of 21864883 is 38846812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21864883 is a prime.

It is not a weakly prime, because it can be changed into another prime (21864853) 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, 10932441 + 10932442.

It is an arithmetic number, because the mean of its divisors is an integer number (10932442).

Almost surely, 2^21864883 is an apocalyptic number.

21864883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21864883 is an equidigital number, since it uses as much as digits as its factorization.

21864883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 40.

The square root of 21864883 is about 4675.9900555925. The cubic root of 21864883 is about 279.6291135346.

The spelling of 21864883 in words is "twenty-one million, eight hundred sixty-four thousand, eight hundred eighty-three".