1221200120222 has 48 divisors (see below), whose sum is σ = 1989525318480. Its totient is φ = 560483193600.

The previous prime is 1221200120221. The next prime is 1221200120227. The reversal of 1221200120222 is 2220210021221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221200120222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221200120221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10346822 + ... + 10464182.

It is an arithmetic number, because the mean of its divisors is an integer number (41448444135).

Almost surely, 2^{1221200120222} is an apocalyptic number.

1221200120222 is a deficient number, since it is larger than the sum of its proper divisors (768325198258).

1221200120222 is a wasteful number, since it uses less digits than its factorization.

1221200120222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117577 (or 117510 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221200120222 its reverse (2220210021221), we get a palindrome (3441410141443).

Subtracting 1221200120222 from its reverse (2220210021221), we obtain a palindrome (999009900999).

The spelling of 1221200120222 in words is "one trillion, two hundred twenty-one billion, two hundred million, one hundred twenty thousand, two hundred twenty-two".