121417209899 has 2 divisors, whose sum is σ = 121417209900. Its totient is φ = 121417209898.

The previous prime is 121417209869. The next prime is 121417209919. The reversal of 121417209899 is 998902714121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121417209899 - 2¹² = 121417205803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121417209899.

It is not a weakly prime, because it can be changed into another prime (121417209869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60708604949 + 60708604950.

It is an arithmetic number, because the mean of its divisors is an integer number (60708604950).

Almost surely, 2^121417209899 is an apocalyptic number.

121417209899 is a deficient number, since it is larger than the sum of its proper divisors (1).

121417209899 is an equidigital number, since it uses as much as digits as its factorization.

121417209899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 53.

The spelling of 121417209899 in words is "one hundred twenty-one billion, four hundred seventeen million, two hundred nine thousand, eight hundred ninety-nine".