21232252 has 18 divisors (see below), whose sum is σ = 39472832. Its totient is φ = 9991104.

The previous prime is 21232249. The next prime is 21232259. The reversal of 21232252 is 25223212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8028 + ... + 10339.

Almost surely, 2^21232252 is an apocalyptic number.

It is an amenable number.

21232252 is a deficient number, since it is larger than the sum of its proper divisors (18240580).

21232252 is a wasteful number, since it uses less digits than its factorization.

21232252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18405 (or 18386 counting only the distinct ones).

The product of its digits is 480, while the sum is 19.

The square root of 21232252 is about 4607.8467856473. The cubic root of 21232252 is about 276.9057793168.

Adding to 21232252 its reverse (25223212), we get a palindrome (46455464).

The spelling of 21232252 in words is "twenty-one million, two hundred thirty-two thousand, two hundred fifty-two".