1121043221 has 2 divisors, whose sum is σ = 1121043222. Its totient is φ = 1121043220.

The previous prime is 1121043193. The next prime is 1121043241. The reversal of 1121043221 is 1223401211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 961930225 + 159112996 = 31015^2 + 12614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121043221 - 2²² = 1116848917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121043221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121043241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560521610 + 560521611.

It is an arithmetic number, because the mean of its divisors is an integer number (560521611).

Almost surely, 2^1121043221 is an apocalyptic number.

It is an amenable number.

1121043221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121043221 is an equidigital number, since it uses as much as digits as its factorization.

1121043221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1121043221 is about 33481.9835284590. The cubic root of 1121043221 is about 1038.8211559596.

Adding to 1121043221 its reverse (1223401211), we get a palindrome (2344444432).

The spelling of 1121043221 in words is "one billion, one hundred twenty-one million, forty-three thousand, two hundred twenty-one".