21109432 has 32 divisors (see below), whose sum is σ = 40550400. Its totient is φ = 10299744.

The previous prime is 21109409. The next prime is 21109441. The reversal of 21109432 is 23490112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80133 + ... + 80395.

It is an arithmetic number, because the mean of its divisors is an integer number (1267200).

Almost surely, 2^21109432 is an apocalyptic number.

It is an amenable number.

21109432 is a deficient number, since it is larger than the sum of its proper divisors (19440968).

21109432 is a wasteful number, since it uses less digits than its factorization.

21109432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 21109432 is about 4594.5001904451. The cubic root of 21109432 is about 276.3708171191.

Adding to 21109432 its reverse (23490112), we get a palindrome (44599544).

The spelling of 21109432 in words is "twenty-one million, one hundred nine thousand, four hundred thirty-two".