21443143229 has 2 divisors, whose sum is σ = 21443143230. Its totient is φ = 21443143228.

The previous prime is 21443143201. The next prime is 21443143231. The reversal of 21443143229 is 92234134412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15937800025 + 5505343204 = 126245^2 + 74198^2 .

It is a cyclic number.

It is not a de Polignac number, because 21443143229 - 2¹⁶ = 21443077693 is a prime.

Together with 21443143231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21443143259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721571614 + 10721571615.

It is an arithmetic number, because the mean of its divisors is an integer number (10721571615).

Almost surely, 2^21443143229 is an apocalyptic number.

It is an amenable number.

21443143229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443143229 is an equidigital number, since it uses as much as digits as its factorization.

21443143229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 35.

The spelling of 21443143229 in words is "twenty-one billion, four hundred forty-three million, one hundred forty-three thousand, two hundred twenty-nine".