1101222201221 has 4 divisors (see below), whose sum is σ = 1101254385132. Its totient is φ = 1101190017312.

The previous prime is 1101222201169. The next prime is 1101222201223. The reversal of 1101222201221 is 1221022221011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 568344100996 + 532878100225 = 753886^2 + 729985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1101222201221 is a prime.

It is a super-2 number, since 2×1101222201221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1101222201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101222201223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16040576 + ... + 16109081.

It is an arithmetic number, because the mean of its divisors is an integer number (275313596283).

Almost surely, 2^{1101222201221} is an apocalyptic number.

It is an amenable number.

1101222201221 is a deficient number, since it is larger than the sum of its proper divisors (32183911).

1101222201221 is an equidigital number, since it uses as much as digits as its factorization.

1101222201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32183910.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1101222201221 its reverse (1221022221011), we get a palindrome (2322244422232).

The spelling of 1101222201221 in words is "one trillion, one hundred one billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".