1221112223012 has 12 divisors (see below), whose sum is σ = 2331214244016. Its totient is φ = 555051010440.

The previous prime is 1221112222987. The next prime is 1221112223029. The reversal of 1221112223012 is 2103222111221.

It is a super-2 number, since 2×1221112223012² (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 3 ways as a sum of consecutive naturals, for example, 13876275218 + ... + 13876275305.

It is an arithmetic number, because the mean of its divisors is an integer number (194267853668).

Almost surely, 2^{1221112223012} is an apocalyptic number.

It is an amenable number.

1221112223012 is a deficient number, since it is larger than the sum of its proper divisors (1110102021004).

1221112223012 is a wasteful number, since it uses less digits than its factorization.

1221112223012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27752550538 (or 27752550536 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221112223012 its reverse (2103222111221), we get a palindrome (3324334334233).

The spelling of 1221112223012 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty-three thousand, twelve".