21294881143 has 2 divisors, whose sum is σ = 21294881144. Its totient is φ = 21294881142.

The previous prime is 21294881089. The next prime is 21294881159. The reversal of 21294881143 is 34118849212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21294881143 - 2⁹ = 21294880631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21294881143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21294831143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10647440571 + 10647440572.

It is an arithmetic number, because the mean of its divisors is an integer number (10647440572).

Almost surely, 2^21294881143 is an apocalyptic number.

21294881143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21294881143 is an equidigital number, since it uses as much as digits as its factorization.

21294881143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 43.

The spelling of 21294881143 in words is "twenty-one billion, two hundred ninety-four million, eight hundred eighty-one thousand, one hundred forty-three".