21193253 has 2 divisors, whose sum is σ = 21193254. Its totient is φ = 21193252.

The previous prime is 21193247. The next prime is 21193259. The reversal of 21193253 is 35239112.

It is a balanced prime because it is at equal distance from previous prime (21193247) and next prime (21193259).

It can be written as a sum of positive squares in only one way, i.e., 20448484 + 744769 = 4522^2 + 863^2 .

It is a cyclic number.

It is not a de Polignac number, because 21193253 - 2¹⁰ = 21192229 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (21193259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10596626 + 10596627.

It is an arithmetic number, because the mean of its divisors is an integer number (10596627).

Almost surely, 2^21193253 is an apocalyptic number.

It is an amenable number.

21193253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21193253 is an equidigital number, since it uses as much as digits as its factorization.

21193253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 26.

The square root of 21193253 is about 4603.6130376043. The cubic root of 21193253 is about 276.7361369716.

The spelling of 21193253 in words is "twenty-one million, one hundred ninety-three thousand, two hundred fifty-three".