21432230 has 8 divisors (see below), whose sum is σ = 38578032. Its totient is φ = 8572888.

The previous prime is 21432211. The next prime is 21432233. The reversal of 21432230 is 3223412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21432199 and 21432208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432233) 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, 1071602 + ... + 1071621.

It is an arithmetic number, because the mean of its divisors is an integer number (4822254).

Almost surely, 2^21432230 is an apocalyptic number.

21432230 is a deficient number, since it is larger than the sum of its proper divisors (17145802).

21432230 is a wasteful number, since it uses less digits than its factorization.

21432230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143230.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21432230 is about 4629.4956528762. The cubic root of 21432230 is about 277.7724186818.

Adding to 21432230 its reverse (3223412), we get a palindrome (24655642).

The spelling of 21432230 in words is "twenty-one million, four hundred thirty-two thousand, two hundred thirty".