121201211123 has 2 divisors, whose sum is σ = 121201211124. Its totient is φ = 121201211122.

The previous prime is 121201211029. The next prime is 121201211149. The reversal of 121201211123 is 321112102121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (321112102121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121201211123 - 2²⁰ = 121200162547 is a prime.

It is a super-2 number, since 2×121201211123² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (121201211023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600605561 + 60600605562.

It is an arithmetic number, because the mean of its divisors is an integer number (60600605562).

Almost surely, 2^121201211123 is an apocalyptic number.

121201211123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201211123 is an equidigital number, since it uses as much as digits as its factorization.

121201211123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121201211123 its reverse (321112102121), we get a palindrome (442313313244).

The spelling of 121201211123 in words is "one hundred twenty-one billion, two hundred one million, two hundred eleven thousand, one hundred twenty-three".