213115121 has 2 divisors, whose sum is σ = 213115122. Its totient is φ = 213115120.

The previous prime is 213115109. The next prime is 213115157. The reversal of 213115121 is 121511312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200618896 + 12496225 = 14164^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 213115121 - 2¹⁸ = 212852977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213115121.

It is not a weakly prime, because it can be changed into another prime (213115321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106557560 + 106557561.

It is an arithmetic number, because the mean of its divisors is an integer number (106557561).

Almost surely, 2^213115121 is an apocalyptic number.

It is an amenable number.

213115121 is a deficient number, since it is larger than the sum of its proper divisors (1).

213115121 is an equidigital number, since it uses as much as digits as its factorization.

213115121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 17.

The square root of 213115121 is about 14598.4629670387. The cubic root of 213115121 is about 597.3168346666.

Adding to 213115121 its reverse (121511312), we get a palindrome (334626433).

The spelling of 213115121 in words is "two hundred thirteen million, one hundred fifteen thousand, one hundred twenty-one".