13213121 has 2 divisors, whose sum is σ = 13213122. Its totient is φ = 13213120.

The previous prime is 13213093. The next prime is 13213127. The reversal of 13213121 is 12131231.

13213121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7756225 + 5456896 = 2785^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 13213121 - 2²² = 9018817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13213096 and 13213105.

It is not a weakly prime, because it can be changed into another prime (13213127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606560 + 6606561.

It is an arithmetic number, because the mean of its divisors is an integer number (6606561).

Almost surely, 2^13213121 is an apocalyptic number.

It is an amenable number.

13213121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13213121 is an equidigital number, since it uses as much as digits as its factorization.

13213121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 14.

The square root of 13213121 is about 3634.9856946073. The cubic root of 13213121 is about 236.4114304060.

Adding to 13213121 its reverse (12131231), we get a palindrome (25344352).

The spelling of 13213121 in words is "thirteen million, two hundred thirteen thousand, one hundred twenty-one".