1221100122202 has 16 divisors (see below), whose sum is σ = 1832309841960. Its totient is φ = 610330226688.

The previous prime is 1221100122199. The next prime is 1221100122217. The reversal of 1221100122202 is 2022210011221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 809602248841 + 411497873361 = 899779^2 + 641481^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115969674 + ... + 115980202.

Almost surely, 2^{1221100122202} is an apocalyptic number.

1221100122202 is a deficient number, since it is larger than the sum of its proper divisors (611209719758).

1221100122202 is a wasteful number, since it uses less digits than its factorization.

1221100122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25905.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221100122202 its reverse (2022210011221), we get a palindrome (3243310133423).

The spelling of 1221100122202 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-two thousand, two hundred two".