21218482291 has 2 divisors, whose sum is σ = 21218482292. Its totient is φ = 21218482290.

The previous prime is 21218482267. The next prime is 21218482297. The reversal of 21218482291 is 19228481212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21218482291 - 2⁷ = 21218482163 is a prime.

It is not a weakly prime, because it can be changed into another prime (21218482297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10609241145 + 10609241146.

It is an arithmetic number, because the mean of its divisors is an integer number (10609241146).

Almost surely, 2^21218482291 is an apocalyptic number.

21218482291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21218482291 is an equidigital number, since it uses as much as digits as its factorization.

21218482291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 40.

The spelling of 21218482291 in words is "twenty-one billion, two hundred eighteen million, four hundred eighty-two thousand, two hundred ninety-one".