18211927274 has 16 divisors (see below), whose sum is σ = 27678003912. Its totient is φ = 8986618368.

The previous prime is 18211927273. The next prime is 18211927339. The reversal of 18211927274 is 47272911281.

It can be written as a sum of positive squares in 4 ways, for example, as 5045971225 + 13165956049 = 71035^2 + 114743^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18211927273) 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 in 7 ways as a sum of consecutive naturals, for example, 120269 + ... + 225584.

Almost surely, 2^18211927274 is an apocalyptic number.

18211927274 is a deficient number, since it is larger than the sum of its proper divisors (9466076638).

18211927274 is a wasteful number, since it uses less digits than its factorization.

18211927274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346201.

The product of its digits is 112896, while the sum is 44.

The spelling of 18211927274 in words is "eighteen billion, two hundred eleven million, nine hundred twenty-seven thousand, two hundred seventy-four".