123421121 has 2 divisors, whose sum is σ = 123421122. Its totient is φ = 123421120.

The previous prime is 123421099. The next prime is 123421171. The reversal of 123421121 is 121124321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101284096 + 22137025 = 10064^2 + 4705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123421121 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123421121.

It is not a weakly prime, because it can be changed into another prime (123421171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61710560 + 61710561.

It is an arithmetic number, because the mean of its divisors is an integer number (61710561).

Almost surely, 2^123421121 is an apocalyptic number.

It is an amenable number.

123421121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123421121 is an equidigital number, since it uses as much as digits as its factorization.

123421121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 17.

The square root of 123421121 is about 11109.5058846017. The cubic root of 123421121 is about 497.8859017758.

Adding to 123421121 its reverse (121124321), we get a palindrome (244545442).

It can be divided in two parts, 123421 and 121, that multiplied together give a palindrome (14933941).

The spelling of 123421121 in words is "one hundred twenty-three million, four hundred twenty-one thousand, one hundred twenty-one".