1221100101112 has 16 divisors (see below), whose sum is σ = 2389108893840. Its totient is φ = 584004396096.

The previous prime is 1221100101101. The next prime is 1221100101127. The reversal of 1221100101112 is 2111010011221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221100101092 and 1221100101101.

It is a congruent number.

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, 3318206613 + ... + 3318206980.

It is an arithmetic number, because the mean of its divisors is an integer number (149319305865).

Almost surely, 2^{1221100101112} is an apocalyptic number.

It is an amenable number.

1221100101112 is a deficient number, since it is larger than the sum of its proper divisors (1168008792728).

1221100101112 is a wasteful number, since it uses less digits than its factorization.

1221100101112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6636413622 (or 6636413618 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221100101112 its reverse (2111010011221), we get a palindrome (3332110112333).

The spelling of 1221100101112 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred one thousand, one hundred twelve".