21432332 has 6 divisors (see below), whose sum is σ = 37506588. Its totient is φ = 10716164.

The previous prime is 21432331. The next prime is 21432347. The reversal of 21432332 is 23323412.

It is not an unprimeable number, because it can be changed into a prime (21432331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2679038 + ... + 2679045.

It is an arithmetic number, because the mean of its divisors is an integer number (6251098).

Almost surely, 2^21432332 is an apocalyptic number.

It is an amenable number.

21432332 is a deficient number, since it is larger than the sum of its proper divisors (16074256).

21432332 is a wasteful number, since it uses less digits than its factorization.

21432332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358087 (or 5358085 counting only the distinct ones).

The product of its digits is 864, while the sum is 20.

The square root of 21432332 is about 4629.5066691819. The cubic root of 21432332 is about 277.7728593381.

Adding to 21432332 its reverse (23323412), we get a palindrome (44755744).

The spelling of 21432332 in words is "twenty-one million, four hundred thirty-two thousand, three hundred thirty-two".