21244132 has 24 divisors (see below), whose sum is σ = 45757376. Its totient is φ = 8404128.

The previous prime is 21244121. The next prime is 21244163. The reversal of 21244132 is 23144212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28818 + ... + 29545.

Almost surely, 2^21244132 is an apocalyptic number.

It is an amenable number.

21244132 is an abundant number, since it is smaller than the sum of its proper divisors (24513244).

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

21244132 is a wasteful number, since it uses less digits than its factorization.

21244132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58387 (or 58385 counting only the distinct ones).

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

The square root of 21244132 is about 4609.1357107380. The cubic root of 21244132 is about 276.9574150281.

Adding to 21244132 its reverse (23144212), we get a palindrome (44388344).

It can be divided in two parts, 212 and 44132, that added together give a palindrome (44344).

The spelling of 21244132 in words is "twenty-one million, two hundred forty-four thousand, one hundred thirty-two".