12211421 has 2 divisors, whose sum is σ = 12211422. Its totient is φ = 12211420.

The previous prime is 12211403. The next prime is 12211447. The reversal of 12211421 is 12411221.

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., 11868025 + 343396 = 3445^2 + 586^2 .

It is an emirp because it is prime and its reverse (12411221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12211421 - 2²² = 8017117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12211396 and 12211405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105710 + 6105711.

It is an arithmetic number, because the mean of its divisors is an integer number (6105711).

Almost surely, 2^12211421 is an apocalyptic number.

It is an amenable number.

12211421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211421 is an equidigital number, since it uses as much as digits as its factorization.

12211421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32, while the sum is 14.

The square root of 12211421 is about 3494.4843682581. The cubic root of 12211421 is about 230.2795655318.

Adding to 12211421 its reverse (12411221), we get a palindrome (24622642).

The spelling of 12211421 in words is "twelve million, two hundred eleven thousand, four hundred twenty-one".