21131295 has 16 divisors (see below), whose sum is σ = 33942240. Its totient is φ = 11225984.

The previous prime is 21131293. The next prime is 21131317. The reversal of 21131295 is 59213112.

It is a cyclic number.

It is not a de Polignac number, because 21131295 - 2¹ = 21131293 is a prime.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1417 + ... + 6653.

It is an arithmetic number, because the mean of its divisors is an integer number (2121390).

Almost surely, 2^21131295 is an apocalyptic number.

21131295 is a deficient number, since it is larger than the sum of its proper divisors (12810945).

21131295 is a wasteful number, since it uses less digits than its factorization.

21131295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5514.

The product of its digits is 540, while the sum is 24.

The square root of 21131295 is about 4596.8788324253. The cubic root of 21131295 is about 276.4661964480.

The spelling of 21131295 in words is "twenty-one million, one hundred thirty-one thousand, two hundred ninety-five".