18033473421 has 16 divisors (see below), whose sum is σ = 26786027520. Its totient is φ = 11990918880.

The previous prime is 18033473417. The next prime is 18033473453. The reversal of 18033473421 is 12437433081.

18033473421 is a `hidden beast` number, since 180 + 3 + 3 + 473 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 18033473421 - 2² = 18033473417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18033473461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 861600 + ... + 882281.

It is an arithmetic number, because the mean of its divisors is an integer number (1674126720).

Almost surely, 2^18033473421 is an apocalyptic number.

It is an amenable number.

18033473421 is a deficient number, since it is larger than the sum of its proper divisors (8752554099).

18033473421 is a wasteful number, since it uses less digits than its factorization.

18033473421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744273 (or 1744267 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 18033473421 in words is "eighteen billion, thirty-three million, four hundred seventy-three thousand, four hundred twenty-one".