1121312321 has 16 divisors (see below), whose sum is σ = 1173553920. Its totient is φ = 1070513280.

The previous prime is 1121312317. The next prime is 1121312327. The reversal of 1121312321 is 1232131211.

It is not a de Polignac number, because 1121312321 - 2² = 1121312317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121312321.

It is not an unprimeable number, because it can be changed into a prime (1121312327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369416 + ... + 372438.

It is an arithmetic number, because the mean of its divisors is an integer number (73347120).

Almost surely, 2^1121312321 is an apocalyptic number.

It is an amenable number.

1121312321 is a deficient number, since it is larger than the sum of its proper divisors (52241599).

1121312321 is a wasteful number, since it uses less digits than its factorization.

1121312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3256.

The product of its digits is 72, while the sum is 17.

The square root of 1121312321 is about 33486.0018664516. The cubic root of 1121312321 is about 1038.9042703311.

Adding to 1121312321 its reverse (1232131211), we get a palindrome (2353443532).

The spelling of 1121312321 in words is "one billion, one hundred twenty-one million, three hundred twelve thousand, three hundred twenty-one".