12221401 has 2 divisors, whose sum is σ = 12221402. Its totient is φ = 12221400.

The previous prime is 12221399. The next prime is 12221413. The reversal of 12221401 is 10412221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 76176 = 3485^2 + 276^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221401 - 2¹ = 12221399 is a prime.

Together with 12221399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12221431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110700 + 6110701.

It is an arithmetic number, because the mean of its divisors is an integer number (6110701).

Almost surely, 2^12221401 is an apocalyptic number.

It is an amenable number.

12221401 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221401 is an equidigital number, since it uses as much as digits as its factorization.

12221401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 12221401 is about 3495.9120412276. The cubic root of 12221401 is about 230.3422818002.

Adding to 12221401 its reverse (10412221), we get a palindrome (22633622).

The spelling of 12221401 in words is "twelve million, two hundred twenty-one thousand, four hundred one".