121123123021 has 2 divisors, whose sum is σ = 121123123022. Its totient is φ = 121123123020.

The previous prime is 121123123001. The next prime is 121123123049. The reversal of 121123123021 is 120321321121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102752302500 + 18370820521 = 320550^2 + 135539^2 .

It is a cyclic number.

It is not a de Polignac number, because 121123123021 - 2²³ = 121114734413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121123123021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121123123001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60561561510 + 60561561511.

It is an arithmetic number, because the mean of its divisors is an integer number (60561561511).

Almost surely, 2^121123123021 is an apocalyptic number.

It is an amenable number.

121123123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121123123021 is an equidigital number, since it uses as much as digits as its factorization.

121123123021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121123123021 its reverse (120321321121), we get a palindrome (241444444142).

The spelling of 121123123021 in words is "one hundred twenty-one billion, one hundred twenty-three million, one hundred twenty-three thousand, twenty-one".