1221100002202 has 4 divisors (see below), whose sum is σ = 1831650003306. Its totient is φ = 610550001100.

The previous prime is 1221100002179. The next prime is 1221100002209. The reversal of 1221100002202 is 2022000011221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 913708486161 + 307391516041 = 955881^2 + 554429^2 .

It is not an unprimeable number, because it can be changed into a prime (1221100002209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305275000549 + ... + 305275000552.

Almost surely, 2^{1221100002202} is an apocalyptic number.

1221100002202 is a deficient number, since it is larger than the sum of its proper divisors (610550001104).

1221100002202 is an equidigital number, since it uses as much as digits as its factorization.

1221100002202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610550001103.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221100002202 its reverse (2022000011221), we get a palindrome (3243100013423).

The spelling of 1221100002202 in words is "one trillion, two hundred twenty-one billion, one hundred million, two thousand, two hundred two".