12212121999989 has 2 divisors, whose sum is σ = 12212121999990. Its totient is φ = 12212121999988.

The previous prime is 12212121999947. The next prime is 12212121999997. The reversal of 12212121999989 is 98999912121221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9092836177489 + 3119285822500 = 3015433^2 + 1766150^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212121999989 - 2¹² = 12212121995893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212121999589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106060999994 + 6106060999995.

It is an arithmetic number, because the mean of its divisors is an integer number (6106060999995).

Almost surely, 2^{12212121999989} is an apocalyptic number.

It is an amenable number.

12212121999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212121999989 is an equidigital number, since it uses as much as digits as its factorization.

12212121999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 65.

The spelling of 12212121999989 in words is "twelve trillion, two hundred twelve billion, one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred eighty-nine".