1121122121221 has 8 divisors (see below), whose sum is σ = 1164198984984. Its totient is φ = 1078794420480.

The previous prime is 1121122121179. The next prime is 1121122121233. The reversal of 1121122121221 is 1221212211211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 55406568996 + 1065715552225 = 235386^2 + 1032335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1121122121221 - 2¹⁵ = 1121122088453 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 (1121122128221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187287706 + ... + 187293691.

It is an arithmetic number, because the mean of its divisors is an integer number (145524873123).

Almost surely, 2^{1121122121221} is an apocalyptic number.

It is an amenable number.

1121122121221 is a deficient number, since it is larger than the sum of its proper divisors (43076863763).

1121122121221 is an equidigital number, since it uses as much as digits as its factorization.

1121122121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374581511.

The product of its digits is 64, while the sum is 19.

Adding to 1121122121221 its reverse (1221212211211), we get a palindrome (2342334332432).

The spelling of 1121122121221 in words is "one trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".