21892867 has 2 divisors, whose sum is σ = 21892868. Its totient is φ = 21892866.

The previous prime is 21892847. The next prime is 21892873. The reversal of 21892867 is 76829812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21892867 - 2¹⁵ = 21860099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21892817) 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, 10946433 + 10946434.

It is an arithmetic number, because the mean of its divisors is an integer number (10946434).

Almost surely, 2^21892867 is an apocalyptic number.

21892867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21892867 is an equidigital number, since it uses as much as digits as its factorization.

21892867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 21892867 is about 4678.9814062464. The cubic root of 21892867 is about 279.7483580955.

The spelling of 21892867 in words is "twenty-one million, eight hundred ninety-two thousand, eight hundred sixty-seven".