1131221342 has 4 divisors (see below), whose sum is σ = 1696832016. Its totient is φ = 565610670.

The previous prime is 1131221309. The next prime is 1131221363. The reversal of 1131221342 is 2431221311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2431221311 = 47 ⋅51728113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282805334 + ... + 282805337.

It is an arithmetic number, because the mean of its divisors is an integer number (424208004).

Almost surely, 2^1131221342 is an apocalyptic number.

1131221342 is a deficient number, since it is larger than the sum of its proper divisors (565610674).

1131221342 is an equidigital number, since it uses as much as digits as its factorization.

1131221342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565610673.

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

The square root of 1131221342 is about 33633.6340885132. The cubic root of 1131221342 is about 1041.9555605781.

Adding to 1131221342 its reverse (2431221311), we get a palindrome (3562442653).

The spelling of 1131221342 in words is "one billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred forty-two".