1321118881 has 2 divisors, whose sum is σ = 1321118882. Its totient is φ = 1321118880.

The previous prime is 1321118879. The next prime is 1321118917. The reversal of 1321118881 is 1888111231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1287374400 + 33744481 = 35880^2 + 5809^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321118881 - 2¹ = 1321118879 is a prime.

It is a super-2 number, since 2×1321118881² = 3490710195469384322, which contains 22 as substring.

Together with 1321118879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1321118081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660559440 + 660559441.

It is an arithmetic number, because the mean of its divisors is an integer number (660559441).

Almost surely, 2^1321118881 is an apocalyptic number.

It is an amenable number.

1321118881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321118881 is an equidigital number, since it uses as much as digits as its factorization.

1321118881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 34.

The square root of 1321118881 is about 36347.1990805344. The cubic root of 1321118881 is about 1097.2711646641.

The spelling of 1321118881 in words is "one billion, three hundred twenty-one million, one hundred eighteen thousand, eight hundred eighty-one".