21443132 has 6 divisors (see below), whose sum is σ = 37525488. Its totient is φ = 10721564.

The previous prime is 21443131. The next prime is 21443141. The reversal of 21443132 is 23134412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680388 + ... + 2680395.

It is an arithmetic number, because the mean of its divisors is an integer number (6254248).

Almost surely, 2^21443132 is an apocalyptic number.

It is an amenable number.

21443132 is a deficient number, since it is larger than the sum of its proper divisors (16082356).

21443132 is a wasteful number, since it uses less digits than its factorization.

21443132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360787 (or 5360785 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 21443132 is about 4630.6729532542. The cubic root of 21443132 is about 277.8195091554.

Adding to 21443132 its reverse (23134412), we get a palindrome (44577544).

The spelling of 21443132 in words is "twenty-one million, four hundred forty-three thousand, one hundred thirty-two".