1220312112 has 40 divisors (see below), whose sum is σ = 3261182640. Its totient is φ = 392743680.

The previous prime is 1220312111. The next prime is 1220312129. The reversal of 1220312112 is 2112130221.

It is a junction number, because it is equal to n+sod(n) for n = 1220312091 and 1220312100.

It is not an unprimeable number, because it can be changed into a prime (1220312111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436939 + ... + 439722.

It is an arithmetic number, because the mean of its divisors is an integer number (81529566).

Almost surely, 2^1220312112 is an apocalyptic number.

1220312112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220312112 is an abundant number, since it is smaller than the sum of its proper divisors (2040870528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220312112 is a wasteful number, since it uses less digits than its factorization.

1220312112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876701 (or 876695 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1220312112 is about 34932.9659777122. The cubic root of 1220312112 is about 1068.6208428580.

Adding to 1220312112 its reverse (2112130221), we get a palindrome (3332442333).

The spelling of 1220312112 in words is "one billion, two hundred twenty million, three hundred twelve thousand, one hundred twelve".