21834253 has 6 divisors (see below), whose sum is σ = 25399086. Its totient is φ = 18715032.

The previous prime is 21834233. The next prime is 21834269. The reversal of 21834253 is 35243812.

It can be written as a sum of positive squares in only one way, i.e., 13557124 + 8277129 = 3682^2 + 2877^2 .

It is not a de Polignac number, because 21834253 - 2¹⁷ = 21703181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21834203) 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 5 ways as a sum of consecutive naturals, for example, 222750 + ... + 222847.

It is an arithmetic number, because the mean of its divisors is an integer number (4233181).

Almost surely, 2^21834253 is an apocalyptic number.

It is an amenable number.

21834253 is a deficient number, since it is larger than the sum of its proper divisors (3564833).

21834253 is an equidigital number, since it uses as much as digits as its factorization.

21834253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445611 (or 445604 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21834253 is about 4672.7136655267. The cubic root of 21834253 is about 279.4984772325.

The spelling of 21834253 in words is "twenty-one million, eight hundred thirty-four thousand, two hundred fifty-three".