21884783 has 2 divisors, whose sum is σ = 21884784. Its totient is φ = 21884782.

The previous prime is 21884773. The next prime is 21884809. The reversal of 21884783 is 38748812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21884783 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21884783.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21884773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942391 + 10942392.

It is an arithmetic number, because the mean of its divisors is an integer number (10942392).

Almost surely, 2^21884783 is an apocalyptic number.

21884783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21884783 is an equidigital number, since it uses as much as digits as its factorization.

21884783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 41.

The square root of 21884783 is about 4678.1174632538. The cubic root of 21884783 is about 279.7139212454.

The spelling of 21884783 in words is "twenty-one million, eight hundred eighty-four thousand, seven hundred eighty-three".