21223230 has 32 divisors (see below), whose sum is σ = 58212864. Its totient is φ = 4850976.

The previous prime is 21223219. The next prime is 21223261. The reversal of 21223230 is 3232212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50322 + ... + 50741.

It is an arithmetic number, because the mean of its divisors is an integer number (1819152).

Almost surely, 2^21223230 is an apocalyptic number.

21223230 is an abundant number, since it is smaller than the sum of its proper divisors (36989634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223230 is a wasteful number, since it uses less digits than its factorization.

21223230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101080.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21223230 is about 4606.8676994244. The cubic root of 21223230 is about 276.8665528627.

Adding to 21223230 its reverse (3232212), we get a palindrome (24455442).

The spelling of 21223230 in words is "twenty-one million, two hundred twenty-three thousand, two hundred thirty".