1143421211221 has 2 divisors, whose sum is σ = 1143421211222. Its totient is φ = 1143421211220.

The previous prime is 1143421211173. The next prime is 1143421211239. The reversal of 1143421211221 is 1221121243411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1112210688996 + 31210522225 = 1054614^2 + 176665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143421211221 - 2¹⁷ = 1143421080149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143421211321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571710605610 + 571710605611.

It is an arithmetic number, because the mean of its divisors is an integer number (571710605611).

Almost surely, 2^{1143421211221} is an apocalyptic number.

It is an amenable number.

1143421211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143421211221 is an equidigital number, since it uses as much as digits as its factorization.

1143421211221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

Adding to 1143421211221 its reverse (1221121243411), we get a palindrome (2364542454632).

The spelling of 1143421211221 in words is "one trillion, one hundred forty-three billion, four hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".