12121619 has 2 divisors, whose sum is σ = 12121620. Its totient is φ = 12121618.

The previous prime is 12121583. The next prime is 12121631. The reversal of 12121619 is 91612121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (91612121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121619 is a prime.

It is a super-2 number, since 2×12121619² = 293867294362322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 12121594 and 12121603.

It is not a weakly prime, because it can be changed into another prime (12121699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060809 + 6060810.

It is an arithmetic number, because the mean of its divisors is an integer number (6060810).

Almost surely, 2^12121619 is an apocalyptic number.

12121619 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121619 is an equidigital number, since it uses as much as digits as its factorization.

12121619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 23.

The square root of 12121619 is about 3481.6115521408. The cubic root of 12121619 is about 229.7136891081.

The spelling of 12121619 in words is "twelve million, one hundred twenty-one thousand, six hundred nineteen".