1221200112222 has 32 divisors (see below), whose sum is σ = 2713995309600. Its totient is φ = 407034111744.

The previous prime is 1221200112163. The next prime is 1221200112277. The reversal of 1221200112222 is 2222110021221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221200112195 and 1221200112204.

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, 219897 + ... + 1578212.

It is an arithmetic number, because the mean of its divisors is an integer number (84812353425).

Almost surely, 2^{1221200112222} is an apocalyptic number.

1221200112222 is an abundant number, since it is smaller than the sum of its proper divisors (1492795197378).

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

1221200112222 is a wasteful number, since it uses less digits than its factorization.

1221200112222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810697 (or 1810691 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221200112222 its reverse (2222110021221), we get a palindrome (3443310133443).

The spelling of 1221200112222 in words is "one trillion, two hundred twenty-one billion, two hundred million, one hundred twelve thousand, two hundred twenty-two".