213020121121 has 2 divisors, whose sum is σ = 213020121122. Its totient is φ = 213020121120.

The previous prime is 213020121043. The next prime is 213020121169. The reversal of 213020121121 is 121121020312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163083514896 + 49936606225 = 403836^2 + 223465^2 .

It is a cyclic number.

It is not a de Polignac number, because 213020121121 - 2²¹ = 213018023969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213020121095 and 213020121104.

It is not a weakly prime, because it can be changed into another prime (213020121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106510060560 + 106510060561.

It is an arithmetic number, because the mean of its divisors is an integer number (106510060561).

Almost surely, 2^213020121121 is an apocalyptic number.

It is an amenable number.

213020121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

213020121121 is an equidigital number, since it uses as much as digits as its factorization.

213020121121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 213020121121 its reverse (121121020312), we get a palindrome (334141141433).

The spelling of 213020121121 in words is "two hundred thirteen billion, twenty million, one hundred twenty-one thousand, one hundred twenty-one".