1321244121 has 4 divisors (see below), whose sum is σ = 1761658832. Its totient is φ = 880829412.

The previous prime is 1321244069. The next prime is 1321244143. The reversal of 1321244121 is 1214421231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1321244121 - 2¹¹ = 1321242073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321244191) 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, 220207351 + ... + 220207356.

It is an arithmetic number, because the mean of its divisors is an integer number (440414708).

Almost surely, 2^1321244121 is an apocalyptic number.

It is an amenable number.

1321244121 is a deficient number, since it is larger than the sum of its proper divisors (440414711).

1321244121 is an equidigital number, since it uses as much as digits as its factorization.

1321244121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440414710.

The product of its digits is 384, while the sum is 21.

The square root of 1321244121 is about 36348.9218684681. The cubic root of 1321244121 is about 1097.3058367643.

Adding to 1321244121 its reverse (1214421231), we get a palindrome (2535665352).

It can be divided in two parts, 132 and 1244121, that added together give a triangular number (1244253 = T₁₅₇₇).

The spelling of 1321244121 in words is "one billion, three hundred twenty-one million, two hundred forty-four thousand, one hundred twenty-one".