1221222220112 has 20 divisors (see below), whose sum is σ = 2367780863040. Its totient is φ = 610181997408.

The previous prime is 1221222220079. The next prime is 1221222220117. The reversal of 1221222220112 is 2110222221221.

It is a super-3 number, since 3×1221222220112³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222220117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26796062 + ... + 26841597.

It is an arithmetic number, because the mean of its divisors is an integer number (118389043152).

Almost surely, 2^{1221222220112} is an apocalyptic number.

It is an amenable number.

1221222220112 is a deficient number, since it is larger than the sum of its proper divisors (1146558642928).

1221222220112 is a wasteful number, since it uses less digits than its factorization.

1221222220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53639090 (or 53639084 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1221222220112 its reverse (2110222221221), we get a palindrome (3331444441333).

The spelling of 1221222220112 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, one hundred twelve".