1220120312 has 16 divisors (see below), whose sum is σ = 2343524400. Its totient is φ = 595180480.

The previous prime is 1220120309. The next prime is 1220120389. The reversal of 1220120312 is 2130210221.

It is a happy number.

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, 1859612 + ... + 1860267.

It is an arithmetic number, because the mean of its divisors is an integer number (146470275).

Almost surely, 2^1220120312 is an apocalyptic number.

It is an amenable number.

1220120312 is a deficient number, since it is larger than the sum of its proper divisors (1123404088).

1220120312 is a wasteful number, since it uses less digits than its factorization.

1220120312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719926 (or 3719922 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1220120312 is about 34930.2206119572. The cubic root of 1220120312 is about 1068.5648538437.

Adding to 1220120312 its reverse (2130210221), we get a palindrome (3350330533).

The spelling of 1220120312 in words is "one billion, two hundred twenty million, one hundred twenty thousand, three hundred twelve".