21432118 has 4 divisors (see below), whose sum is σ = 32148180. Its totient is φ = 10716058.

The previous prime is 21432107. The next prime is 21432157. The reversal of 21432118 is 81123412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358028 + ... + 5358031.

It is an arithmetic number, because the mean of its divisors is an integer number (8037045).

Almost surely, 2^21432118 is an apocalyptic number.

21432118 is a deficient number, since it is larger than the sum of its proper divisors (10716062).

21432118 is a wasteful number, since it uses less digits than its factorization.

21432118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10716061.

The product of its digits is 384, while the sum is 22.

The square root of 21432118 is about 4629.4835565104. The cubic root of 21432118 is about 277.7719348223.

The spelling of 21432118 in words is "twenty-one million, four hundred thirty-two thousand, one hundred eighteen".