18441721203 has 4 divisors (see below), whose sum is σ = 24588961608. Its totient is φ = 12294480800.

The previous prime is 18441721201. The next prime is 18441721231. The reversal of 18441721203 is 30212714481.

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

It is a cyclic number.

It is not a de Polignac number, because 18441721203 - 2¹ = 18441721201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18441721201) 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, 3073620198 + ... + 3073620203.

It is an arithmetic number, because the mean of its divisors is an integer number (6147240402).

Almost surely, 2^18441721203 is an apocalyptic number.

18441721203 is a deficient number, since it is larger than the sum of its proper divisors (6147240405).

18441721203 is an equidigital number, since it uses as much as digits as its factorization.

18441721203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147240404.

The product of its (nonzero) digits is 10752, while the sum is 33.

The spelling of 18441721203 in words is "eighteen billion, four hundred forty-one million, seven hundred twenty-one thousand, two hundred three".