21214432 has 12 divisors (see below), whose sum is σ = 41765976. Its totient is φ = 10607200.

The previous prime is 21214429. The next prime is 21214433. The reversal of 21214432 is 23441212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214433) by changing a digit.

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 as a sum of consecutive naturals, namely, 331444 + ... + 331507.

It is an arithmetic number, because the mean of its divisors is an integer number (3480498).

Almost surely, 2^21214432 is an apocalyptic number.

It is an amenable number.

21214432 is a deficient number, since it is larger than the sum of its proper divisors (20551544).

21214432 is an equidigital number, since it uses as much as digits as its factorization.

21214432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662961 (or 662953 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 21214432 is about 4605.9127217089. The cubic root of 21214432 is about 276.8282896231.

Adding to 21214432 its reverse (23441212), we get a palindrome (44655644).

The spelling of 21214432 in words is "twenty-one million, two hundred fourteen thousand, four hundred thirty-two".