213000121 has 2 divisors, whose sum is σ = 213000122. Its totient is φ = 213000120.

The previous prime is 213000103. The next prime is 213000133. The reversal of 213000121 is 121000312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209525625 + 3474496 = 14475^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 213000121 - 2⁹ = 212999609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213000098 and 213000107.

It is not a weakly prime, because it can be changed into another prime (213000181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106500060 + 106500061.

It is an arithmetic number, because the mean of its divisors is an integer number (106500061).

Almost surely, 2^213000121 is an apocalyptic number.

It is an amenable number.

213000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

213000121 is an equidigital number, since it uses as much as digits as its factorization.

213000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 213000121 is about 14594.5236647175. The cubic root of 213000121 is about 597.2093750692.

Adding to 213000121 its reverse (121000312), we get a palindrome (334000433).

The spelling of 213000121 in words is "two hundred thirteen million, one hundred twenty-one", and thus it is an aban number.