21796253 has 2 divisors, whose sum is σ = 21796254. Its totient is φ = 21796252.

The previous prime is 21796237. The next prime is 21796279. The reversal of 21796253 is 35269712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18344089 + 3452164 = 4283^2 + 1858^2 .

It is a cyclic number.

It is not a de Polignac number, because 21796253 - 2⁴ = 21796237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21796223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898126 + 10898127.

It is an arithmetic number, because the mean of its divisors is an integer number (10898127).

Almost surely, 2^21796253 is an apocalyptic number.

It is an amenable number.

21796253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21796253 is an equidigital number, since it uses as much as digits as its factorization.

21796253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 21796253 is about 4668.6457351142. The cubic root of 21796253 is about 279.3362381181.

The spelling of 21796253 in words is "twenty-one million, seven hundred ninety-six thousand, two hundred fifty-three".