21223442330 has 8 divisors (see below), whose sum is σ = 38202196212. Its totient is φ = 8489376928.

The previous prime is 21223442329. The next prime is 21223442347. The reversal of 21223442330 is 3324432212.

It can be written as a sum of positive squares in 2 ways, for example, as 19703456161 + 1519986169 = 140369^2 + 38987^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21223442330.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061172107 + ... + 1061172126.

Almost surely, 2^21223442330 is an apocalyptic number.

21223442330 is a deficient number, since it is larger than the sum of its proper divisors (16978753882).

21223442330 is a wasteful number, since it uses less digits than its factorization.

21223442330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122344240.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21223442330 its reverse (3324432212), we get a palindrome (24547874542).

The spelling of 21223442330 in words is "twenty-one billion, two hundred twenty-three million, four hundred forty-two thousand, three hundred thirty".