21113432 has 8 divisors (see below), whose sum is σ = 39587700. Its totient is φ = 10556712.

The previous prime is 21113431. The next prime is 21113437. The reversal of 21113432 is 23431112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21113432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319582 + ... + 1319597.

Almost surely, 2^21113432 is an apocalyptic number.

It is an amenable number.

21113432 is a deficient number, since it is larger than the sum of its proper divisors (18474268).

21113432 is a wasteful number, since it uses less digits than its factorization.

21113432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639185 (or 2639181 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 21113432 is about 4594.9354728875. The cubic root of 21113432 is about 276.3882724040.

Adding to 21113432 its reverse (23431112), we get a palindrome (44544544).

The spelling of 21113432 in words is "twenty-one million, one hundred thirteen thousand, four hundred thirty-two".