18021334773 has 24 divisors (see below), whose sum is σ = 26916196320. Its totient is φ = 10707627840.

The previous prime is 18021334759. The next prime is 18021334777. The reversal of 18021334773 is 37743312081.

It is not a de Polignac number, because 18021334773 - 2¹³ = 18021326581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021334777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 598143 + ... + 627548.

It is an arithmetic number, because the mean of its divisors is an integer number (1121508180).

Almost surely, 2^18021334773 is an apocalyptic number.

18021334773 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18021334773 is a deficient number, since it is larger than the sum of its proper divisors (8894861547).

18021334773 is a wasteful number, since it uses less digits than its factorization.

18021334773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225749 (or 1225736 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 18021334773 in words is "eighteen billion, twenty-one million, three hundred thirty-four thousand, seven hundred seventy-three".