1222121312 has 24 divisors (see below), whose sum is σ = 2406888792. Its totient is φ = 610848000.

The previous prime is 1222121293. The next prime is 1222121357. The reversal of 1222121312 is 2131212221.

It is a congruent number.

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, 129887 + ... + 138977.

It is an arithmetic number, because the mean of its divisors is an integer number (100287033).

Almost surely, 2^1222121312 is an apocalyptic number.

It is an amenable number.

1222121312 is a deficient number, since it is larger than the sum of its proper divisors (1184767480).

1222121312 is an equidigital number, since it uses as much as digits as its factorization.

1222121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13302 (or 13294 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 1222121312 is about 34958.8516973885. The cubic root of 1222121312 is about 1069.1486843704.

Adding to 1222121312 its reverse (2131212221), we get a palindrome (3353333533).

Subtracting 1222121312 from its reverse (2131212221), we obtain a palindrome (909090909).

It can be divided in two parts, 12221 and 21312, that added together give a palindrome (33533).

The spelling of 1222121312 in words is "one billion, two hundred twenty-two million, one hundred twenty-one thousand, three hundred twelve".