1121241221 has 2 divisors, whose sum is σ = 1121241222. Its totient is φ = 1121241220.

The previous prime is 1121241203. The next prime is 1121241223. The reversal of 1121241221 is 1221421211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1116228100 + 5013121 = 33410^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121241221 - 2⁶ = 1121241157 is a prime.

It is a super-4 number, since 4×1121241221⁴ (a number of 37 digits) contains 4444 as substring.

Together with 1121241223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121241221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121241223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560620610 + 560620611.

It is an arithmetic number, because the mean of its divisors is an integer number (560620611).

Almost surely, 2^1121241221 is an apocalyptic number.

It is an amenable number.

1121241221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121241221 is an equidigital number, since it uses as much as digits as its factorization.

1121241221 is an evil number, because the sum of its binary digits is even.

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

The square root of 1121241221 is about 33484.9402119819. The cubic root of 1121241221 is about 1038.8823116393.

Adding to 1121241221 its reverse (1221421211), we get a palindrome (2342662432).

The spelling of 1121241221 in words is "one billion, one hundred twenty-one million, two hundred forty-one thousand, two hundred twenty-one".