1221222202101 has 12 divisors (see below), whose sum is σ = 1924350136800. Its totient is φ = 740134667880.

The previous prime is 1221222202021. The next prime is 1221222202103. The reversal of 1221222202101 is 1012022221221.

It is a happy number.

It is not a de Polignac number, because 1221222202101 - 2¹⁵ = 1221222169333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222202103) 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 in 11 ways as a sum of consecutive naturals, for example, 6167788801 + ... + 6167788998.

It is an arithmetic number, because the mean of its divisors is an integer number (160362511400).

Almost surely, 2^{1221222202101} is an apocalyptic number.

1221222202101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221222202101 is a deficient number, since it is larger than the sum of its proper divisors (703127934699).

1221222202101 is a wasteful number, since it uses less digits than its factorization.

1221222202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12335577816 (or 12335577813 counting only the distinct ones).

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

Adding to 1221222202101 its reverse (1012022221221), we get a palindrome (2233244423322).

The spelling of 1221222202101 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred two thousand, one hundred one".