21432044 has 36 divisors (see below), whose sum is σ = 40679184. Its totient is φ = 9860928.

The previous prime is 21432023. The next prime is 21432077. The reversal of 21432044 is 44023412.

It is a super-3 number, since 3×21432044³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77234 + ... + 77510.

Almost surely, 2^21432044 is an apocalyptic number.

It is an amenable number.

21432044 is a deficient number, since it is larger than the sum of its proper divisors (19247140).

21432044 is a wasteful number, since it uses less digits than its factorization.

21432044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 21432044 is about 4629.4755642513. The cubic root of 21432044 is about 277.7716151285.

Adding to 21432044 its reverse (44023412), we get a palindrome (65455456).

The spelling of 21432044 in words is "twenty-one million, four hundred thirty-two thousand, forty-four".