1221011222202 has 12 divisors (see below), whose sum is σ = 2645524314810. Its totient is φ = 407003740728.

The previous prime is 1221011222159. The next prime is 1221011222213. The reversal of 1221011222202 is 2022221101221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1214891132841 + 6120089361 = 1102221^2 + 78231^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67833956789 = 1221011222202 / (1 + 2 + 2 + 1 + 0 + 1 + 1 + 2 + 2 + 2 + 2 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33916978377 + ... + 33916978412.

Almost surely, 2^{1221011222202} is an apocalyptic number.

1221011222202 is an abundant number, since it is smaller than the sum of its proper divisors (1424513092608).

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

1221011222202 is a wasteful number, since it uses less digits than its factorization.

1221011222202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67833956797 (or 67833956794 counting only the distinct ones).

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

Adding to 1221011222202 its reverse (2022221101221), we get a palindrome (3243232323423).

The spelling of 1221011222202 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred twenty-two thousand, two hundred two".