21893827 has 2 divisors, whose sum is σ = 21893828. Its totient is φ = 21893826.

The previous prime is 21893813. The next prime is 21893831. The reversal of 21893827 is 72839812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21893827 - 2⁷ = 21893699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21893827.

It is not a weakly prime, because it can be changed into another prime (21893887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946913 + 10946914.

It is an arithmetic number, because the mean of its divisors is an integer number (10946914).

Almost surely, 2^21893827 is an apocalyptic number.

21893827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21893827 is an equidigital number, since it uses as much as digits as its factorization.

21893827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 21893827 is about 4679.0839915522. The cubic root of 21893827 is about 279.7524470148.

The spelling of 21893827 in words is "twenty-one million, eight hundred ninety-three thousand, eight hundred twenty-seven".