1221011001112 has 64 divisors (see below), whose sum is σ = 2770516362240. Its totient is φ = 492481036800.

The previous prime is 1221011001107. The next prime is 1221011001121. The reversal of 1221011001112 is 2111001101221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221011001092 and 1221011001101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31311787 + ... + 31350757.

It is an arithmetic number, because the mean of its divisors is an integer number (43289318160).

Almost surely, 2^{1221011001112} is an apocalyptic number.

It is an amenable number.

1221011001112 is an abundant number, since it is smaller than the sum of its proper divisors (1549505361128).

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

1221011001112 is a wasteful number, since it uses less digits than its factorization.

1221011001112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71912 (or 71908 counting only the distinct ones).

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

Adding to 1221011001112 its reverse (2111001101221), we get a palindrome (3332012102333).

The spelling of 1221011001112 in words is "one trillion, two hundred twenty-one billion, eleven million, one thousand, one hundred twelve".