1221002022112 has 48 divisors (see below), whose sum is σ = 2453394003984. Its totient is φ = 598000896000.

The previous prime is 1221002022067. The next prime is 1221002022181. The reversal of 1221002022112 is 2112202001221.

It is a happy number.

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

It is a congruent number.

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, 827314 + ... + 1768177.

It is an arithmetic number, because the mean of its divisors is an integer number (51112375083).

Almost surely, 2^{1221002022112} is an apocalyptic number.

It is an amenable number.

1221002022112 is an abundant number, since it is smaller than the sum of its proper divisors (1232391981872).

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

1221002022112 is a wasteful number, since it uses less digits than its factorization.

1221002022112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595803 (or 2595795 counting only the distinct ones).

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

Adding to 1221002022112 its reverse (2112202001221), we get a palindrome (3333204023333).

The spelling of 1221002022112 in words is "one trillion, two hundred twenty-one billion, two million, twenty-two thousand, one hundred twelve".