21894359 has 4 divisors (see below), whose sum is σ = 21917616. Its totient is φ = 21871104.

The previous prime is 21894347. The next prime is 21894371. The reversal of 21894359 is 95349812.

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

It is an interprime number because it is at equal distance from previous prime (21894347) and next prime (21894371).

It is a cyclic number.

It is not a de Polignac number, because 21894359 - 2¹⁶ = 21828823 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 (21894329) 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, 10154 + ... + 12119.

It is an arithmetic number, because the mean of its divisors is an integer number (5479404).

Almost surely, 2^21894359 is an apocalyptic number.

21894359 is a deficient number, since it is larger than the sum of its proper divisors (23257).

21894359 is an equidigital number, since it uses as much as digits as its factorization.

21894359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23256.

The product of its digits is 77760, while the sum is 41.

The square root of 21894359 is about 4679.1408399406. The cubic root of 21894359 is about 279.7547129061.

The spelling of 21894359 in words is "twenty-one million, eight hundred ninety-four thousand, three hundred fifty-nine".