121219999 has 2 divisors, whose sum is σ = 121220000. Its totient is φ = 121219998.

The previous prime is 121219997. The next prime is 121220017. The reversal of 121219999 is 999912121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121219999 - 2¹ = 121219997 is a prime.

Together with 121219997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121219991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60609999 + 60610000.

It is an arithmetic number, because the mean of its divisors is an integer number (60610000).

Almost surely, 2^121219999 is an apocalyptic number.

121219999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121219999 is an equidigital number, since it uses as much as digits as its factorization.

121219999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 43.

The square root of 121219999 is about 11009.9954132597. The cubic root of 121219999 is about 494.9083243481.

The spelling of 121219999 in words is "one hundred twenty-one million, two hundred nineteen thousand, nine hundred ninety-nine".