21466253 has 4 divisors (see below), whose sum is σ = 22046460. Its totient is φ = 20886048.

The previous prime is 21466243. The next prime is 21466259. The reversal of 21466253 is 35266412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11744329 + 9721924 = 3427^2 + 3118^2 .

It is a cyclic number.

It is not a de Polignac number, because 21466253 - 2¹² = 21462157 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 (21466259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290048 + ... + 290121.

It is an arithmetic number, because the mean of its divisors is an integer number (5511615).

Almost surely, 2^21466253 is an apocalyptic number.

It is an amenable number.

21466253 is a deficient number, since it is larger than the sum of its proper divisors (580207).

21466253 is an equidigital number, since it uses as much as digits as its factorization.

21466253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580206.

The product of its digits is 8640, while the sum is 29.

The square root of 21466253 is about 4633.1687860470. The cubic root of 21466253 is about 277.9193260037.

The spelling of 21466253 in words is "twenty-one million, four hundred sixty-six thousand, two hundred fifty-three".