21102232 has 8 divisors (see below), whose sum is σ = 39566700. Its totient is φ = 10551112.

The previous prime is 21102209. The next prime is 21102239. The reversal of 21102232 is 23220112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318882 + ... + 1318897.

Almost surely, 2^21102232 is an apocalyptic number.

It is an amenable number.

21102232 is a deficient number, since it is larger than the sum of its proper divisors (18464468).

21102232 is a wasteful number, since it uses less digits than its factorization.

21102232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637785 (or 2637781 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21102232 is about 4593.7165781097. The cubic root of 21102232 is about 276.3393920487.

Adding to 21102232 its reverse (23220112), we get a palindrome (44322344).

The spelling of 21102232 in words is "twenty-one million, one hundred two thousand, two hundred thirty-two".