12221519 has 2 divisors, whose sum is σ = 12221520. Its totient is φ = 12221518.

The previous prime is 12221497. The next prime is 12221527. The reversal of 12221519 is 91512221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12221519 - 2⁸ = 12221263 is a prime.

It is a super-2 number, since 2×12221519² = 298731053334722, 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 = 12221494 and 12221503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110759 + 6110760.

It is an arithmetic number, because the mean of its divisors is an integer number (6110760).

Almost surely, 2^12221519 is an apocalyptic number.

12221519 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221519 is an equidigital number, since it uses as much as digits as its factorization.

12221519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 12221519 is about 3495.9289180417. The cubic root of 12221519 is about 230.3430231309.

The spelling of 12221519 in words is "twelve million, two hundred twenty-one thousand, five hundred nineteen".