121221122189 has 2 divisors, whose sum is σ = 121221122190. Its totient is φ = 121221122188.

The previous prime is 121221122177. The next prime is 121221122201. The reversal of 121221122189 is 981221122121.

It is a balanced prime because it is at equal distance from previous prime (121221122177) and next prime (121221122201).

It can be written as a sum of positive squares in only one way, i.e., 67141619689 + 54079502500 = 259117^2 + 232550^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221122189 - 2²⁰ = 121220073613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221122089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610561094 + 60610561095.

It is an arithmetic number, because the mean of its divisors is an integer number (60610561095).

Almost surely, 2^121221122189 is an apocalyptic number.

It is an amenable number.

121221122189 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221122189 is an equidigital number, since it uses as much as digits as its factorization.

121221122189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 32.

It can be divided in two parts, 12122 and 1122189, that added together give a palindrome (1134311).

The spelling of 121221122189 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred eighty-nine".