21893367 has 4 divisors (see below), whose sum is σ = 29191160. Its totient is φ = 14595576.

The previous prime is 21893353. The next prime is 21893387. The reversal of 21893367 is 76339812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21893367 - 2⁷ = 21893239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893317) 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 in 3 ways as a sum of consecutive naturals, for example, 3648892 + ... + 3648897.

It is an arithmetic number, because the mean of its divisors is an integer number (7297790).

Almost surely, 2^21893367 is an apocalyptic number.

21893367 is a deficient number, since it is larger than the sum of its proper divisors (7297793).

21893367 is an equidigital number, since it uses as much as digits as its factorization.

21893367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7297792.

The product of its digits is 54432, while the sum is 39.

The square root of 21893367 is about 4679.0348363738. The cubic root of 21893367 is about 279.7504877559.

The spelling of 21893367 in words is "twenty-one million, eight hundred ninety-three thousand, three hundred sixty-seven".