12221863 has 2 divisors, whose sum is σ = 12221864. Its totient is φ = 12221862.

The previous prime is 12221851. The next prime is 12221887. The reversal of 12221863 is 36812221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221863 is a prime.

It is equal to p₈₀₁₆₃₇ and since 12221863 and 801637 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110931 + 6110932.

It is an arithmetic number, because the mean of its divisors is an integer number (6110932).

Almost surely, 2^12221863 is an apocalyptic number.

12221863 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221863 is an equidigital number, since it uses as much as digits as its factorization.

12221863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 12221863 is about 3495.9781177805. The cubic root of 12221863 is about 230.3451842714.

The spelling of 12221863 in words is "twelve million, two hundred twenty-one thousand, eight hundred sixty-three".