12121891619 has 2 divisors, whose sum is σ = 12121891620. Its totient is φ = 12121891618.

The previous prime is 12121891597. The next prime is 12121891673. The reversal of 12121891619 is 91619812121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12121891619 - 2³² = 7826924323 is a prime.

It is a super-2 number, since 2×12121891619² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12121891679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060945809 + 6060945810.

It is an arithmetic number, because the mean of its divisors is an integer number (6060945810).

Almost surely, 2^12121891619 is an apocalyptic number.

12121891619 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121891619 is an equidigital number, since it uses as much as digits as its factorization.

12121891619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 41.

The spelling of 12121891619 in words is "twelve billion, one hundred twenty-one million, eight hundred ninety-one thousand, six hundred nineteen".