123210111001 has 2 divisors, whose sum is σ = 123210111002. Its totient is φ = 123210111000.

The previous prime is 123210110983. The next prime is 123210111007. The reversal of 123210111001 is 100111012321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108398977600 + 14811133401 = 329240^2 + 121701^2 .

It is a cyclic number.

It is not a de Polignac number, because 123210111001 - 2²¹ = 123208013849 is a prime.

It is not a weakly prime, because it can be changed into another prime (123210111007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61605055500 + 61605055501.

It is an arithmetic number, because the mean of its divisors is an integer number (61605055501).

Almost surely, 2^123210111001 is an apocalyptic number.

It is an amenable number.

123210111001 is a deficient number, since it is larger than the sum of its proper divisors (1).

123210111001 is an equidigital number, since it uses as much as digits as its factorization.

123210111001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 123210111001 its reverse (100111012321), we get a palindrome (223321123322).

The spelling of 123210111001 in words is "one hundred twenty-three billion, two hundred ten million, one hundred eleven thousand, one".