1221122012012 has 24 divisors (see below), whose sum is σ = 2492085741600. Its totient is φ = 523338004560.

The previous prime is 1221122012009. The next prime is 1221122012041. The reversal of 1221122012012 is 2102102211221.

It is a super-2 number, since 2×1221122012012² (a number of 25 digits) contains 22 as substring.

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, 445013939 + ... + 445016682.

It is an arithmetic number, because the mean of its divisors is an integer number (103836905900).

Almost surely, 2^{1221122012012} is an apocalyptic number.

It is an amenable number.

1221122012012 is an abundant number, since it is smaller than the sum of its proper divisors (1270963729588).

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

1221122012012 is an equidigital number, since it uses as much as digits as its factorization.

1221122012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890030646 (or 890030630 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221122012012 its reverse (2102102211221), we get a palindrome (3323224223233).

The spelling of 1221122012012 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, twelve thousand, twelve".