1221110000012 has 24 divisors (see below), whose sum is σ = 2501786343840. Its totient is φ = 510568640640.

The previous prime is 1221110000009. The next prime is 1221110000081. The reversal of 1221110000012 is 2100000111221.

It is a super-2 number, since 2×1221110000012² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221109999948 and 1221110000002.

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, 531841187 + ... + 531843482.

It is an arithmetic number, because the mean of its divisors is an integer number (104241097660).

Almost surely, 2^{1221110000012} is an apocalyptic number.

It is an amenable number.

1221110000012 is an abundant number, since it is smaller than the sum of its proper divisors (1280676343828).

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

1221110000012 is a wasteful number, since it uses less digits than its factorization.

1221110000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063684721 (or 1063684719 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221110000012 its reverse (2100000111221), we get a palindrome (3321110111233).

The spelling of 1221110000012 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, twelve", and thus it is an aban number.