1221222111201 has 16 divisors (see below), whose sum is σ = 1810145349120. Its totient is φ = 813730741200.

The previous prime is 1221222111199. The next prime is 1221222111211. The reversal of 1221222111201 is 1021112221221.

It is not a de Polignac number, because 1221222111201 - 2¹ = 1221222111199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221222111211) 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 15 ways as a sum of consecutive naturals, for example, 11538930 + ... + 11644283.

It is an arithmetic number, because the mean of its divisors is an integer number (113134084320).

Almost surely, 2^{1221222111201} is an apocalyptic number.

It is an amenable number.

1221222111201 is a deficient number, since it is larger than the sum of its proper divisors (588923237919).

1221222111201 is a wasteful number, since it uses less digits than its factorization.

1221222111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23185173 (or 23185167 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221222111201 its reverse (1021112221221), we get a palindrome (2242334332422).

The spelling of 1221222111201 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, two hundred one".