18281362221 has 24 divisors (see below), whose sum is σ = 27937372320. Its totient is φ = 11487492576.

The previous prime is 18281362219. The next prime is 18281362241. The reversal of 18281362221 is 12226318281.

It is a happy number.

18281362221 is a `hidden beast` number, since 1 + 8 + 2 + 8 + 1 + 3 + 622 + 21 = 666.

It is not a de Polignac number, because 18281362221 - 2¹ = 18281362219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18281362241) 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 in 23 ways as a sum of consecutive naturals, for example, 237655 + ... + 305028.

It is an arithmetic number, because the mean of its divisors is an integer number (1164057180).

Almost surely, 2^18281362221 is an apocalyptic number.

It is an amenable number.

18281362221 is a deficient number, since it is larger than the sum of its proper divisors (9656010099).

18281362221 is a wasteful number, since it uses less digits than its factorization.

18281362221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542905 (or 542902 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The spelling of 18281362221 in words is "eighteen billion, two hundred eighty-one million, three hundred sixty-two thousand, two hundred twenty-one".