123021111121 has 2 divisors, whose sum is σ = 123021111122. Its totient is φ = 123021111120.

The previous prime is 123021111113. The next prime is 123021111181. The reversal of 123021111121 is 121111120321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116254403521 + 6766707600 = 340961^2 + 82260^2 .

It is an emirp because it is prime and its reverse (121111120321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123021111121 - 2³ = 123021111113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123021111095 and 123021111104.

It is not a weakly prime, because it can be changed into another prime (123021111181) 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, 61510555560 + 61510555561.

It is an arithmetic number, because the mean of its divisors is an integer number (61510555561).

Almost surely, 2^123021111121 is an apocalyptic number.

It is an amenable number.

123021111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021111121 is an equidigital number, since it uses as much as digits as its factorization.

123021111121 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 16.

Adding to 123021111121 its reverse (121111120321), we get a palindrome (244132231442).

The spelling of 123021111121 in words is "one hundred twenty-three billion, twenty-one million, one hundred eleven thousand, one hundred twenty-one".