13011121 has 2 divisors, whose sum is σ = 13011122. Its totient is φ = 13011120.

The previous prime is 13011113. The next prime is 13011133. The reversal of 13011121 is 12111031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8767521 + 4243600 = 2961^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 13011121 - 2³ = 13011113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13011098 and 13011107.

It is not a weakly prime, because it can be changed into another prime (13011421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6505560 + 6505561.

It is an arithmetic number, because the mean of its divisors is an integer number (6505561).

Almost surely, 2^13011121 is an apocalyptic number.

It is an amenable number.

13011121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13011121 is an equidigital number, since it uses as much as digits as its factorization.

13011121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 13011121 is about 3607.0931510012. The cubic root of 13011121 is about 235.2004988748.

Adding to 13011121 its reverse (12111031), we get a palindrome (25122152).

The spelling of 13011121 in words is "thirteen million, eleven thousand, one hundred twenty-one".