21444132 has 12 divisors (see below), whose sum is σ = 50036336. Its totient is φ = 7148040.

The previous prime is 21444131. The next prime is 21444139. The reversal of 21444132 is 23144412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21444099 and 21444108.

It is not an unprimeable number, because it can be changed into a prime (21444131) 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 in 3 ways as a sum of consecutive naturals, for example, 893494 + ... + 893517.

Almost surely, 2^21444132 is an apocalyptic number.

It is an amenable number.

21444132 is an abundant number, since it is smaller than the sum of its proper divisors (28592204).

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

21444132 is a wasteful number, since it uses less digits than its factorization.

21444132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787018 (or 1787016 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 21444132 is about 4630.7809276622. The cubic root of 21444132 is about 277.8238277906.

Adding to 21444132 its reverse (23144412), we get a palindrome (44588544).

It can be divided in two parts, 21 and 444132, that added together give a triangular number (444153 = T₉₄₂).

The spelling of 21444132 in words is "twenty-one million, four hundred forty-four thousand, one hundred thirty-two".