1121323421 has 2 divisors, whose sum is σ = 1121323422. Its totient is φ = 1121323420.

The previous prime is 1121323403. The next prime is 1121323429. The reversal of 1121323421 is 1243231211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 946792900 + 174530521 = 30770^2 + 13211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121323421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1121323393 and 1121323402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121323429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560661710 + 560661711.

It is an arithmetic number, because the mean of its divisors is an integer number (560661711).

Almost surely, 2^1121323421 is an apocalyptic number.

It is an amenable number.

1121323421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121323421 is an equidigital number, since it uses as much as digits as its factorization.

1121323421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 1121323421 is about 33486.1676069388. The cubic root of 1121323421 is about 1038.9076983975.

Adding to 1121323421 its reverse (1243231211), we get a palindrome (2364554632).

The spelling of 1121323421 in words is "one billion, one hundred twenty-one million, three hundred twenty-three thousand, four hundred twenty-one".