12221851 has 2 divisors, whose sum is σ = 12221852. Its totient is φ = 12221850.

The previous prime is 12221849. The next prime is 12221863. The reversal of 12221851 is 15812221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12221851 - 2¹ = 12221849 is a prime.

Together with 12221849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12221801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110925 + 6110926.

It is an arithmetic number, because the mean of its divisors is an integer number (6110926).

Almost surely, 2^12221851 is an apocalyptic number.

12221851 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221851 is an equidigital number, since it uses as much as digits as its factorization.

12221851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 22.

The square root of 12221851 is about 3495.9764015222. The cubic root of 12221851 is about 230.3451088834.

The spelling of 12221851 in words is "twelve million, two hundred twenty-one thousand, eight hundred fifty-one".