21432693 has 4 divisors (see below), whose sum is σ = 28576928. Its totient is φ = 14288460.

The previous prime is 21432679. The next prime is 21432701. The reversal of 21432693 is 39623412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21432693 - 2⁵ = 21432661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21432693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572113 + ... + 3572118.

It is an arithmetic number, because the mean of its divisors is an integer number (7144232).

Almost surely, 2^21432693 is an apocalyptic number.

It is an amenable number.

21432693 is a deficient number, since it is larger than the sum of its proper divisors (7144235).

21432693 is an equidigital number, since it uses as much as digits as its factorization.

21432693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7144234.

The product of its digits is 7776, while the sum is 30.

The square root of 21432693 is about 4629.5456580533. The cubic root of 21432693 is about 277.7744189046.

The spelling of 21432693 in words is "twenty-one million, four hundred thirty-two thousand, six hundred ninety-three".