12213144421 has 2 divisors, whose sum is σ = 12213144422. Its totient is φ = 12213144420.

The previous prime is 12213144409. The next prime is 12213144481. The reversal of 12213144421 is 12444131221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6871581025 + 5341563396 = 82895^2 + 73086^2 .

It is an emirp because it is prime and its reverse (12444131221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12213144421 - 2⁹ = 12213143909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12213144481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106572210 + 6106572211.

It is an arithmetic number, because the mean of its divisors is an integer number (6106572211).

Almost surely, 2^12213144421 is an apocalyptic number.

It is an amenable number.

12213144421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12213144421 is an equidigital number, since it uses as much as digits as its factorization.

12213144421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 25.

Adding to 12213144421 its reverse (12444131221), we get a palindrome (24657275642).

The spelling of 12213144421 in words is "twelve billion, two hundred thirteen million, one hundred forty-four thousand, four hundred twenty-one".