1221110012112 has 40 divisors (see below), whose sum is σ = 3256293369600. Its totient is φ = 393906455040.

The previous prime is 1221110012029. The next prime is 1221110012197. The reversal of 1221110012112 is 2112100111221.

It is a happy number.

It is a super-2 number, since 2×1221110012112² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221110012091 and 1221110012100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410317737 + ... + 410320712.

It is an arithmetic number, because the mean of its divisors is an integer number (81407334240).

Almost surely, 2^{1221110012112} is an apocalyptic number.

1221110012112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221110012112 is an abundant number, since it is smaller than the sum of its proper divisors (2035183357488).

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

1221110012112 is a wasteful number, since it uses less digits than its factorization.

1221110012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820638491 (or 820638485 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221110012112 its reverse (2112100111221), we get a palindrome (3333210123333).

The spelling of 1221110012112 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, twelve thousand, one hundred twelve".