1320201121 has 4 divisors (see below), whose sum is σ = 1320300100. Its totient is φ = 1320102144.

The previous prime is 1320201109. The next prime is 1320201143. The reversal of 1320201121 is 1211020231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1211020231 = 20261 ⋅59771.

It can be written as a sum of positive squares in 2 ways, for example, as 115347600 + 1204853521 = 10740^2 + 34711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320201121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320201151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25656 + ... + 57433.

It is an arithmetic number, because the mean of its divisors is an integer number (330075025).

Almost surely, 2^1320201121 is an apocalyptic number.

It is an amenable number.

1320201121 is a deficient number, since it is larger than the sum of its proper divisors (98979).

1320201121 is an equidigital number, since it uses as much as digits as its factorization.

1320201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98978.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1320201121 is about 36334.5719804156. The cubic root of 1320201121 is about 1097.0170202723.

Adding to 1320201121 its reverse (1211020231), we get a palindrome (2531221352).

It can be divided in two parts, 1320201 and 121, that multiplied together give a square (159744321 = 12639²).

The spelling of 1320201121 in words is "one billion, three hundred twenty million, two hundred one thousand, one hundred twenty-one".