21252293 has 2 divisors, whose sum is σ = 21252294. Its totient is φ = 21252292.

The previous prime is 21252289. The next prime is 21252323. The reversal of 21252293 is 39225212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10903204 + 10349089 = 3302^2 + 3217^2 .

It is a cyclic number.

It is not a de Polignac number, because 21252293 - 2² = 21252289 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21252223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626146 + 10626147.

It is an arithmetic number, because the mean of its divisors is an integer number (10626147).

Almost surely, 2^21252293 is an apocalyptic number.

It is an amenable number.

21252293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21252293 is an equidigital number, since it uses as much as digits as its factorization.

21252293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 21252293 is about 4610.0209327074. The cubic root of 21252293 is about 276.9928751746.

The spelling of 21252293 in words is "twenty-one million, two hundred fifty-two thousand, two hundred ninety-three".