18293043021 has 32 divisors (see below), whose sum is σ = 27340056576. Its totient is φ = 10783344000.

The previous prime is 18293043019. The next prime is 18293043029. The reversal of 18293043021 is 12034039281.

It is not a de Polignac number, because 18293043021 - 2¹ = 18293043019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18293043029) 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 31 ways as a sum of consecutive naturals, for example, 427420 + ... + 468266.

It is an arithmetic number, because the mean of its divisors is an integer number (854376768).

Almost surely, 2^18293043021 is an apocalyptic number.

18293043021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18293043021 is a deficient number, since it is larger than the sum of its proper divisors (9047013555).

18293043021 is a wasteful number, since it uses less digits than its factorization.

18293043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41233.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 18293043021 in words is "eighteen billion, two hundred ninety-three million, forty-three thousand, twenty-one".