1212221120202 has 20 divisors (see below), whose sum is σ = 2716273251186. Its totient is φ = 404073706680.

The previous prime is 1212221120183. The next prime is 1212221120203. The reversal of 1212221120202 is 2020211222121.

It is a happy number.

1212221120202 is a `hidden beast` number, since 121 + 2 + 221 + 120 + 202 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1113001790121 + 99219330081 = 1054989^2 + 314991^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1212221120203) 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 9 ways as a sum of consecutive naturals, for example, 3741423049 + ... + 3741423372.

Almost surely, 2^{1212221120202} is an apocalyptic number.

1212221120202 is an abundant number, since it is smaller than the sum of its proper divisors (1504052130984).

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

1212221120202 is an equidigital number, since it uses as much as digits as its factorization.

1212221120202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7482846435 (or 7482846426 counting only the distinct ones).

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

Adding to 1212221120202 its reverse (2020211222121), we get a palindrome (3232432342323).

The spelling of 1212221120202 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, two hundred two".