21250252 has 24 divisors (see below), whose sum is σ = 40061952. Its totient is φ = 9834000.

The previous prime is 21250217. The next prime is 21250253. The reversal of 21250252 is 25205212.

It is not an unprimeable number, because it can be changed into a prime (21250253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874 + ... + 6577.

It is an arithmetic number, because the mean of its divisors is an integer number (1669248).

Almost surely, 2^21250252 is an apocalyptic number.

It is an amenable number.

21250252 is a deficient number, since it is larger than the sum of its proper divisors (18811700).

21250252 is a wasteful number, since it uses less digits than its factorization.

21250252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7509 (or 7507 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 21250252 is about 4609.7995618031. The cubic root of 21250252 is about 276.9840077306.

Adding to 21250252 its reverse (25205212), we get a palindrome (46455464).

The spelling of 21250252 in words is "twenty-one million, two hundred fifty thousand, two hundred fifty-two".