1221310222 has 32 divisors (see below), whose sum is σ = 2019012480. Its totient is φ = 549475680.

The previous prime is 1221310199. The next prime is 1221310241. The reversal of 1221310222 is 2220131221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221310196 and 1221310205.

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, 1198029 + ... + 1199047.

It is an arithmetic number, because the mean of its divisors is an integer number (63094140).

Almost surely, 2^1221310222 is an apocalyptic number.

1221310222 is a deficient number, since it is larger than the sum of its proper divisors (797702258).

1221310222 is a wasteful number, since it uses less digits than its factorization.

1221310222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221310222 is about 34947.2491335155. The cubic root of 1221310222 is about 1068.9121100060.

Adding to 1221310222 its reverse (2220131221), we get a palindrome (3441441443).

The spelling of 1221310222 in words is "one billion, two hundred twenty-one million, three hundred ten thousand, two hundred twenty-two".