21432893 has 8 divisors (see below), whose sum is σ = 23041920. Its totient is φ = 19872000.

The previous prime is 21432881. The next prime is 21432913. The reversal of 21432893 is 39823412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21432893 - 2²⁰ = 20384317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11108 + ... + 12893.

It is an arithmetic number, because the mean of its divisors is an integer number (2880240).

Almost surely, 2^21432893 is an apocalyptic number.

It is an amenable number.

21432893 is a deficient number, since it is larger than the sum of its proper divisors (1609027).

21432893 is a wasteful number, since it uses less digits than its factorization.

21432893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24067.

The product of its digits is 10368, while the sum is 32.

The square root of 21432893 is about 4629.5672583947. The cubic root of 21432893 is about 277.7752829228.

The spelling of 21432893 in words is "twenty-one million, four hundred thirty-two thousand, eight hundred ninety-three".