1220231312112 has 40 divisors (see below), whose sum is σ = 3211740913104. Its totient is φ = 399069359104.

The previous prime is 1220231312077. The next prime is 1220231312137. The reversal of 1220231312112 is 2112131320221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239822793 + ... + 239827880.

Almost surely, 2^{1220231312112} is an apocalyptic number.

1220231312112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220231312112 is an abundant number, since it is smaller than the sum of its proper divisors (1991509600992).

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

1220231312112 is a wasteful number, since it uses less digits than its factorization.

1220231312112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479650737 (or 479650731 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1220231312112 its reverse (2112131320221), we get a palindrome (3332362632333).

The spelling of 1220231312112 in words is "one trillion, two hundred twenty billion, two hundred thirty-one million, three hundred twelve thousand, one hundred twelve".