21143224243 has 2 divisors, whose sum is σ = 21143224244. Its totient is φ = 21143224242.

The previous prime is 21143224127. The next prime is 21143224279. The reversal of 21143224243 is 34242234112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21143224243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21143254243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571612121 + 10571612122.

It is an arithmetic number, because the mean of its divisors is an integer number (10571612122).

Almost surely, 2^21143224243 is an apocalyptic number.

21143224243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143224243 is an equidigital number, since it uses as much as digits as its factorization.

21143224243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 28.

Adding to 21143224243 its reverse (34242234112), we get a palindrome (55385458355).

The spelling of 21143224243 in words is "twenty-one billion, one hundred forty-three million, two hundred twenty-four thousand, two hundred forty-three".