121221211123 has 2 divisors, whose sum is σ = 121221211124. Its totient is φ = 121221211122.

The previous prime is 121221211121. The next prime is 121221211147. The reversal of 121221211123 is 321112122121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121221211123 - 2¹ = 121221211121 is a prime.

It is a super-2 number, since 2×121221211123² (a number of 23 digits) contains 22 as substring.

Together with 121221211121, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121221211123.

It is not a weakly prime, because it can be changed into another prime (121221211121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610605561 + 60610605562.

It is an arithmetic number, because the mean of its divisors is an integer number (60610605562).

Almost surely, 2^121221211123 is an apocalyptic number.

121221211123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221211123 is an equidigital number, since it uses as much as digits as its factorization.

121221211123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 19.

Adding to 121221211123 its reverse (321112122121), we get a palindrome (442333333244).

The spelling of 121221211123 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, one hundred twenty-three".