121400015123 has 2 divisors, whose sum is σ = 121400015124. Its totient is φ = 121400015122.

The previous prime is 121400015117. The next prime is 121400015141. The reversal of 121400015123 is 321510004121.

It is a weak prime.

It is an emirp because it is prime and its reverse (321510004121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121400015123 - 2¹⁸ = 121399752979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121400015095 and 121400015104.

It is not a weakly prime, because it can be changed into another prime (121400015423) 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, 60700007561 + 60700007562.

It is an arithmetic number, because the mean of its divisors is an integer number (60700007562).

Almost surely, 2^121400015123 is an apocalyptic number.

121400015123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121400015123 is an equidigital number, since it uses as much as digits as its factorization.

121400015123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 121400015123 its reverse (321510004121), we get a palindrome (442910019244).

The spelling of 121400015123 in words is "one hundred twenty-one billion, four hundred million, fifteen thousand, one hundred twenty-three".