123210121 has 2 divisors, whose sum is σ = 123210122. Its totient is φ = 123210120.

The previous prime is 123210091. The next prime is 123210133. The reversal of 123210121 is 121012321.

123210121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123210000 + 121 = 11100^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 123210121 - 2¹³ = 123201929 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (123210161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61605060 + 61605061.

It is an arithmetic number, because the mean of its divisors is an integer number (61605061).

Almost surely, 2^123210121 is an apocalyptic number.

It is an amenable number.

123210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123210121 is an equidigital number, since it uses as much as digits as its factorization.

123210121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 123210121 is about 11100.0054504491. The cubic root of 123210121 is about 497.6020123629.

Adding to 123210121 its reverse (121012321), we get a palindrome (244222442).

The spelling of 123210121 in words is "one hundred twenty-three million, two hundred ten thousand, one hundred twenty-one".