1122121022221 has 4 divisors (see below), whose sum is σ = 1122123170844. Its totient is φ = 1122118873600.

The previous prime is 1122121022219. The next prime is 1122121022257. The reversal of 1122121022221 is 1222201212211.

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 818773429321 + 303347592900 = 904861^2 + 550770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1122121022221 - 2¹ = 1122121022219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122121022621) 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, 268731 + ... + 1521991.

It is an arithmetic number, because the mean of its divisors is an integer number (280530792711).

Almost surely, 2^{1122121022221} is an apocalyptic number.

It is an amenable number.

1122121022221 is a deficient number, since it is larger than the sum of its proper divisors (2148623).

1122121022221 is an equidigital number, since it uses as much as digits as its factorization.

1122121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148622.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1122121022221 its reverse (1222201212211), we get a palindrome (2344322234432).

The spelling of 1122121022221 in words is "one trillion, one hundred twenty-two billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".