21294357 has 16 divisors (see below), whose sum is σ = 32520192. Its totient is φ = 12141360.

The previous prime is 21294347. The next prime is 21294359. The reversal of 21294357 is 75349212.

It is not a de Polignac number, because 21294357 - 2⁴ = 21294341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12448 + ... + 14054.

It is an arithmetic number, because the mean of its divisors is an integer number (2032512).

Almost surely, 2^21294357 is an apocalyptic number.

It is an amenable number.

21294357 is a deficient number, since it is larger than the sum of its proper divisors (11225835).

21294357 is a wasteful number, since it uses less digits than its factorization.

21294357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248.

The product of its digits is 15120, while the sum is 33.

The square root of 21294357 is about 4614.5809127157. The cubic root of 21294357 is about 277.1755025212.

The spelling of 21294357 in words is "twenty-one million, two hundred ninety-four thousand, three hundred fifty-seven".