12122121989 has 2 divisors, whose sum is σ = 12122121990. Its totient is φ = 12122121988.

The previous prime is 12122121953. The next prime is 12122122049. The reversal of 12122121989 is 98912122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12096700225 + 25421764 = 109985^2 + 5042^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122121989 - 2³² = 7827154693 is a prime.

It is a super-2 number, since 2×12122121989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12122121919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061060994 + 6061060995.

It is an arithmetic number, because the mean of its divisors is an integer number (6061060995).

Almost surely, 2^12122121989 is an apocalyptic number.

It is an amenable number.

12122121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122121989 is an equidigital number, since it uses as much as digits as its factorization.

12122121989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 38.

The spelling of 12122121989 in words is "twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, nine hundred eighty-nine".