21112252 has 24 divisors (see below), whose sum is σ = 44061696. Its totient is φ = 8654448.

The previous prime is 21112241. The next prime is 21112279. The reversal of 21112252 is 25221112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15748 + ... + 17035.

It is an arithmetic number, because the mean of its divisors is an integer number (1835904).

Almost surely, 2^21112252 is an apocalyptic number.

It is an amenable number.

21112252 is an abundant number, since it is smaller than the sum of its proper divisors (22949444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112252 is a wasteful number, since it uses less digits than its factorization.

21112252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32817 (or 32815 counting only the distinct ones).

The product of its digits is 80, while the sum is 16.

The square root of 21112252 is about 4594.8070688550. The cubic root of 21112252 is about 276.3831233242.

Adding to 21112252 its reverse (25221112), we get a palindrome (46333364).

The spelling of 21112252 in words is "twenty-one million, one hundred twelve thousand, two hundred fifty-two".