21371395 has 8 divisors (see below), whose sum is σ = 25749360. Its totient is φ = 17028000.

The previous prime is 21371377. The next prime is 21371401. The reversal of 21371395 is 59317312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21371395 - 2⁷ = 21371267 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7260 + ... + 9769.

It is an arithmetic number, because the mean of its divisors is an integer number (3218670).

Almost surely, 2^21371395 is an apocalyptic number.

21371395 is a deficient number, since it is larger than the sum of its proper divisors (4377965).

21371395 is a wasteful number, since it uses less digits than its factorization.

21371395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17285.

The product of its digits is 5670, while the sum is 31.

The square root of 21371395 is about 4622.9206136381. The cubic root of 21371395 is about 277.5093522806.

The spelling of 21371395 in words is "twenty-one million, three hundred seventy-one thousand, three hundred ninety-five".