121211212289 has 2 divisors, whose sum is σ = 121211212290. Its totient is φ = 121211212288.

The previous prime is 121211212103. The next prime is 121211212301. The reversal of 121211212289 is 982212112121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87714891889 + 33496320400 = 296167^2 + 183020^2 .

It is an emirp because it is prime and its reverse (982212112121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121211212289 - 2²⁴ = 121194435073 is a prime.

It is not a weakly prime, because it can be changed into another prime (121211212589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605606144 + 60605606145.

It is an arithmetic number, because the mean of its divisors is an integer number (60605606145).

Almost surely, 2^121211212289 is an apocalyptic number.

It is an amenable number.

121211212289 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211212289 is an equidigital number, since it uses as much as digits as its factorization.

121211212289 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.

The spelling of 121211212289 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, two hundred eighty-nine".