1230222221 has 4 divisors (see below), whose sum is σ = 1302588252. Its totient is φ = 1157856192.

The previous prime is 1230222211. The next prime is 1230222239. The reversal of 1230222221 is 1222220321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1016653225 + 213568996 = 31885^2 + 14614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230222221 - 2¹⁸ = 1229960077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 72366013 = 1230222221 / (1 + 2 + 3 + 0 + 2 + 2 + 2 + 2 + 2 + 1).

It is a Duffinian number.

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 1230222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230222211) 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, 36182990 + ... + 36183023.

It is an arithmetic number, because the mean of its divisors is an integer number (325647063).

Almost surely, 2^1230222221 is an apocalyptic number.

It is an amenable number.

1230222221 is a deficient number, since it is larger than the sum of its proper divisors (72366031).

1230222221 is an equidigital number, since it uses as much as digits as its factorization.

1230222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72366030.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1230222221 is about 35074.5238171525. The cubic root of 1230222221 is about 1071.5057906699.

Adding to 1230222221 its reverse (1222220321), we get a palindrome (2452442542).

The spelling of 1230222221 in words is "one billion, two hundred thirty million, two hundred twenty-two thousand, two hundred twenty-one".