1221131020112 has 20 divisors (see below), whose sum is σ = 2367664585140. Its totient is φ = 610120804608.

The previous prime is 1221131020069. The next prime is 1221131020157. The reversal of 1221131020112 is 2110201311221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 560545700416 + 660585319696 = 748696^2 + 812764^2 .

It is a super-3 number, since 3×1221131020112³ (a number of 37 digits) contains 333 as substring.

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, 27771437 + ... + 27815372.

It is an arithmetic number, because the mean of its divisors is an integer number (118383229257).

Almost surely, 2^{1221131020112} is an apocalyptic number.

It is an amenable number.

1221131020112 is a deficient number, since it is larger than the sum of its proper divisors (1146533565028).

1221131020112 is a wasteful number, since it uses less digits than its factorization.

1221131020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55588190 (or 55588184 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1221131020112 its reverse (2110201311221), we get a palindrome (3331332331333).

The spelling of 1221131020112 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, twenty thousand, one hundred twelve".