1221002120112 has 20 divisors (see below), whose sum is σ = 3154255477080. Its totient is φ = 407000706688.

The previous prime is 1221002120071. The next prime is 1221002120119. The reversal of 1221002120112 is 2110212001221.

It is a junction number, because it is equal to n+sod(n) for n = 1221002120091 and 1221002120100.

It is not an unprimeable number, because it can be changed into a prime (1221002120119) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12718772037 + ... + 12718772132.

It is an arithmetic number, because the mean of its divisors is an integer number (157712773854).

Almost surely, 2^{1221002120112} is an apocalyptic number.

1221002120112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221002120112 is an abundant number, since it is smaller than the sum of its proper divisors (1933253356968).

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

1221002120112 is a wasteful number, since it uses less digits than its factorization.

1221002120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25437544180 (or 25437544174 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221002120112 its reverse (2110212001221), we get a palindrome (3331214121333).

The spelling of 1221002120112 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty thousand, one hundred twelve".