21443332 has 12 divisors (see below), whose sum is σ = 37858716. Its totient is φ = 10626560.

The previous prime is 21443329. The next prime is 21443333. The reversal of 21443332 is 23334412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3261636 + 18181696 = 1806^2 + 4264^2 .

It is not an unprimeable number, because it can be changed into a prime (21443333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23269 + ... + 24172.

It is an arithmetic number, because the mean of its divisors is an integer number (3154893).

Almost surely, 2^21443332 is an apocalyptic number.

It is an amenable number.

21443332 is a deficient number, since it is larger than the sum of its proper divisors (16415384).

21443332 is a wasteful number, since it uses less digits than its factorization.

21443332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47558 (or 47556 counting only the distinct ones).

The product of its digits is 1728, while the sum is 22.

The square root of 21443332 is about 4630.6945483372. The cubic root of 21443332 is about 277.8203728932.

Adding to 21443332 its reverse (23334412), we get a palindrome (44777744).

It can be divided in two parts, 2144 and 3332, that added together give a square (5476 = 74²).

The spelling of 21443332 in words is "twenty-one million, four hundred forty-three thousand, three hundred thirty-two".