21913359 has 32 divisors (see below), whose sum is σ = 32820480. Its totient is φ = 12918528.

The previous prime is 21913349. The next prime is 21913363. The reversal of 21913359 is 95331912.

It is not a de Polignac number, because 21913359 - 2⁴ = 21913343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21913349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122332 + ... + 122510.

It is an arithmetic number, because the mean of its divisors is an integer number (1025640).

Almost surely, 2^21913359 is an apocalyptic number.

21913359 is a deficient number, since it is larger than the sum of its proper divisors (10907121).

21913359 is a wasteful number, since it uses less digits than its factorization.

21913359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311.

The product of its digits is 7290, while the sum is 33.

The square root of 21913359 is about 4681.1706869116. The cubic root of 21913359 is about 279.8356135425.

The spelling of 21913359 in words is "twenty-one million, nine hundred thirteen thousand, three hundred fifty-nine".