12219999 has 16 divisors (see below), whose sum is σ = 17840640. Its totient is φ = 7378560.

The previous prime is 12219997. The next prime is 12220003. The reversal of 12219999 is 99991221.

It is not a de Polignac number, because 12219999 - 2¹ = 12219997 is a prime.

12219999 is a modest number, since divided by 9999 gives 1221 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 12219999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12219997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11607 + ... + 12615.

It is an arithmetic number, because the mean of its divisors is an integer number (1115040).

Almost surely, 2^12219999 is an apocalyptic number.

12219999 is a deficient number, since it is larger than the sum of its proper divisors (5620641).

12219999 is a wasteful number, since it uses less digits than its factorization.

12219999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390.

The product of its digits is 26244, while the sum is 42.

The square root of 12219999 is about 3495.7115155573. The cubic root of 12219999 is about 230.3334734203. Note that the first 3 decimals are identical.

The spelling of 12219999 in words is "twelve million, two hundred nineteen thousand, nine hundred ninety-nine".