1221022020112 has 40 divisors (see below), whose sum is σ = 2490326546400. Its totient is φ = 578359279872.

The previous prime is 1221022020107. The next prime is 1221022020151. The reversal of 1221022020112 is 2110202201221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13155564 + ... + 13248052.

It is an arithmetic number, because the mean of its divisors is an integer number (62258163660).

Almost surely, 2^{1221022020112} is an apocalyptic number.

It is an amenable number.

1221022020112 is an abundant number, since it is smaller than the sum of its proper divisors (1269304526288).

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

1221022020112 is a wasteful number, since it uses less digits than its factorization.

1221022020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135943 (or 135937 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221022020112 its reverse (2110202201221), we get a palindrome (3331224221333).

The spelling of 1221022020112 in words is "one trillion, two hundred twenty-one billion, twenty-two million, twenty thousand, one hundred twelve".