18113021033 has 4 divisors (see below), whose sum is σ = 18602562180. Its totient is φ = 17623479888.

The previous prime is 18113021009. The next prime is 18113021039. The reversal of 18113021033 is 33012031181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12120248464 + 5992772569 = 110092^2 + 77413^2 .

It is a cyclic number.

It is not a de Polignac number, because 18113021033 - 2¹⁴ = 18113004649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18113021039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244770518 + ... + 244770591.

It is an arithmetic number, because the mean of its divisors is an integer number (4650640545).

Almost surely, 2^18113021033 is an apocalyptic number.

It is an amenable number.

18113021033 is a deficient number, since it is larger than the sum of its proper divisors (489541147).

18113021033 is an equidigital number, since it uses as much as digits as its factorization.

18113021033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489541146.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 18113021033 in words is "eighteen billion, one hundred thirteen million, twenty-one thousand, thirty-three".