13210121 has 2 divisors, whose sum is σ = 13210122. Its totient is φ = 13210120.

The previous prime is 13210117. The next prime is 13210129. The reversal of 13210121 is 12101231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9388096 + 3822025 = 3064^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 13210121 - 2² = 13210117 is a prime.

It is not a weakly prime, because it can be changed into another prime (13210129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6605060 + 6605061.

It is an arithmetic number, because the mean of its divisors is an integer number (6605061).

Almost surely, 2^13210121 is an apocalyptic number.

It is an amenable number.

13210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13210121 is an equidigital number, since it uses as much as digits as its factorization.

13210121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 13210121 is about 3634.5730148121. The cubic root of 13210121 is about 236.3935368799.

Adding to 13210121 its reverse (12101231), we get a palindrome (25311352).

It can be divided in two parts, 13210 and 121, that added together give a palindrome (13331).

The spelling of 13210121 in words is "thirteen million, two hundred ten thousand, one hundred twenty-one".