21252466 has 8 divisors (see below), whose sum is σ = 32093100. Its totient is φ = 10554768.

The previous prime is 21252457. The next prime is 21252487. The reversal of 21252466 is 66425212.

It can be written as a sum of positive squares in 2 ways, for example, as 18740241 + 2512225 = 4329^2 + 1585^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21252466² = 903334622162312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35361 + ... + 35956.

Almost surely, 2^21252466 is an apocalyptic number.

21252466 is a deficient number, since it is larger than the sum of its proper divisors (10840634).

21252466 is a wasteful number, since it uses less digits than its factorization.

21252466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71468.

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

The square root of 21252466 is about 4610.0396961415. The cubic root of 21252466 is about 276.9936267741.

Adding to 21252466 its reverse (66425212), we get a palindrome (87677678).

The spelling of 21252466 in words is "twenty-one million, two hundred fifty-two thousand, four hundred sixty-six".