21125432 has 16 divisors (see below), whose sum is σ = 39660000. Its totient is φ = 10549440.

The previous prime is 21125393. The next prime is 21125443. The reversal of 21125432 is 23452112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9569 + ... + 11567.

It is an arithmetic number, because the mean of its divisors is an integer number (2478750).

Almost surely, 2^21125432 is an apocalyptic number.

It is an amenable number.

21125432 is a deficient number, since it is larger than the sum of its proper divisors (18534568).

21125432 is a wasteful number, since it uses less digits than its factorization.

21125432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326 (or 3322 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21125432 is about 4596.2410728768. The cubic root of 21125432 is about 276.4406250346.

Adding to 21125432 its reverse (23452112), we get a palindrome (44577544).

The spelling of 21125432 in words is "twenty-one million, one hundred twenty-five thousand, four hundred thirty-two".