21195293 has 6 divisors (see below), whose sum is σ = 24655806. Its totient is φ = 18167352.

The previous prime is 21195257. The next prime is 21195299. The reversal of 21195293 is 39259112.

It can be written as a sum of positive squares in only one way, i.e., 14341369 + 6853924 = 3787^2 + 2618^2 .

It is not a de Polignac number, because 21195293 - 2⁸ = 21195037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21195299) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216230 + ... + 216327.

It is an arithmetic number, because the mean of its divisors is an integer number (4109301).

Almost surely, 2^21195293 is an apocalyptic number.

It is an amenable number.

21195293 is a deficient number, since it is larger than the sum of its proper divisors (3460513).

21195293 is an equidigital number, since it uses as much as digits as its factorization.

21195293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432571 (or 432564 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 21195293 is about 4603.8345973764. The cubic root of 21195293 is about 276.7450159547.

The spelling of 21195293 in words is "twenty-one million, one hundred ninety-five thousand, two hundred ninety-three".