1221221101112 has 8 divisors (see below), whose sum is σ = 2289789564600. Its totient is φ = 610610550552.

The previous prime is 1221221101109. The next prime is 1221221101127. The reversal of 1221221101112 is 2111011221221.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76326318812 + ... + 76326318827.

It is an arithmetic number, because the mean of its divisors is an integer number (286223695575).

Almost surely, 2^{1221221101112} is an apocalyptic number.

It is an amenable number.

1221221101112 is a deficient number, since it is larger than the sum of its proper divisors (1068568463488).

1221221101112 is a wasteful number, since it uses less digits than its factorization.

1221221101112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152652637645 (or 152652637641 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221221101112 its reverse (2111011221221), we get a palindrome (3332232322333).

The spelling of 1221221101112 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, one hundred twelve".