1142343221 has 2 divisors, whose sum is σ = 1142343222. Its totient is φ = 1142343220.

The previous prime is 1142343179. The next prime is 1142343227. The reversal of 1142343221 is 1223432411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1141764100 + 579121 = 33790^2 + 761^2 .

It is an emirp because it is prime and its reverse (1223432411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1142343221 - 2²⁶ = 1075234357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1142343227) 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, 571171610 + 571171611.

It is an arithmetic number, because the mean of its divisors is an integer number (571171611).

Almost surely, 2^1142343221 is an apocalyptic number.

It is an amenable number.

1142343221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142343221 is an equidigital number, since it uses as much as digits as its factorization.

1142343221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 1142343221 is about 33798.5683276674. The cubic root of 1142343221 is about 1045.3591772205.

Adding to 1142343221 its reverse (1223432411), we get a palindrome (2365775632).

The spelling of 1142343221 in words is "one billion, one hundred forty-two million, three hundred forty-three thousand, two hundred twenty-one".