1326013121 has 4 divisors (see below), whose sum is σ = 1326313392. Its totient is φ = 1325712852.

The previous prime is 1326013079. The next prime is 1326013163. The reversal of 1326013121 is 1213106231.

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 an interprime number because it is at equal distance from previous prime (1326013079) and next prime (1326013163).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1326013121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1326013093 and 1326013102.

It is not an unprimeable number, because it can be changed into a prime (1326013721) 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, 143411 + ... + 152376.

It is an arithmetic number, because the mean of its divisors is an integer number (331578348).

Almost surely, 2^1326013121 is an apocalyptic number.

It is an amenable number.

1326013121 is a deficient number, since it is larger than the sum of its proper divisors (300271).

1326013121 is an equidigital number, since it uses as much as digits as its factorization.

1326013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300270.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1326013121 is about 36414.4630744434. The cubic root of 1326013121 is about 1098.6244848110.

Adding to 1326013121 its reverse (1213106231), we get a palindrome (2539119352).

The spelling of 1326013121 in words is "one billion, three hundred twenty-six million, thirteen thousand, one hundred twenty-one".