18271282221 has 12 divisors (see below), whose sum is σ = 26409667648. Its totient is φ = 12172632264.

The previous prime is 18271282207. The next prime is 18271282241. The reversal of 18271282221 is 12228217281.

It is not a de Polignac number, because 18271282221 - 2¹¹ = 18271280173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18271282241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 671125 + ... + 697818.

Almost surely, 2^18271282221 is an apocalyptic number.

It is an amenable number.

18271282221 is a deficient number, since it is larger than the sum of its proper divisors (8138385427).

18271282221 is a wasteful number, since it uses less digits than its factorization.

18271282221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370432 (or 1370429 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The spelling of 18271282221 in words is "eighteen billion, two hundred seventy-one million, two hundred eighty-two thousand, two hundred twenty-one".