12101211989 has 2 divisors, whose sum is σ = 12101211990. Its totient is φ = 12101211988.

The previous prime is 12101211979. The next prime is 12101212031. The reversal of 12101211989 is 98911210121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12080208100 + 21003889 = 109910^2 + 4583^2 .

It is an emirp because it is prime and its reverse (98911210121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12101211989 - 2¹² = 12101207893 is a prime.

It is a super-2 number, since 2×12101211989² (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 (12101211979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050605994 + 6050605995.

It is an arithmetic number, because the mean of its divisors is an integer number (6050605995).

Almost surely, 2^12101211989 is an apocalyptic number.

It is an amenable number.

12101211989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101211989 is an equidigital number, since it uses as much as digits as its factorization.

12101211989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 12101211989 in words is "twelve billion, one hundred one million, two hundred eleven thousand, nine hundred eighty-nine".