1221102222201 has 6 divisors (see below), whose sum is σ = 1763814320970. Its totient is φ = 814068148128.

The previous prime is 1221102222169. The next prime is 1221102222203. The reversal of 1221102222201 is 1022222011221.

It is a happy number.

1221102222201 is a `hidden beast` number, since 1 + 221 + 1 + 0 + 222 + 220 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1032867722601 + 188234499600 = 1016301^2 + 433860^2 .

It is not a de Polignac number, because 1221102222201 - 2⁵ = 1221102222169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221102222203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67839012336 + ... + 67839012353.

It is an arithmetic number, because the mean of its divisors is an integer number (293969053495).

Almost surely, 2^{1221102222201} is an apocalyptic number.

It is an amenable number.

1221102222201 is a deficient number, since it is larger than the sum of its proper divisors (542712098769).

1221102222201 is a wasteful number, since it uses less digits than its factorization.

1221102222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135678024695 (or 135678024692 counting only the distinct ones).

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

Adding to 1221102222201 its reverse (1022222011221), we get a palindrome (2243324233422).

The spelling of 1221102222201 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty-two thousand, two hundred one".