18211028483821 has 4 divisors (see below), whose sum is σ = 19169503667200. Its totient is φ = 17252553300444.

The previous prime is 18211028483771. The next prime is 18211028483831. The reversal of 18211028483821 is 12838482011281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18211028483821 - 2⁹ = 18211028483309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211028483831) 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, 479237591661 + ... + 479237591698.

It is an arithmetic number, because the mean of its divisors is an integer number (4792375916800).

Almost surely, 2^{18211028483821} is an apocalyptic number.

It is an amenable number.

18211028483821 is a deficient number, since it is larger than the sum of its proper divisors (958475183379).

18211028483821 is an equidigital number, since it uses as much as digits as its factorization.

18211028483821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958475183378.

The product of its (nonzero) digits is 393216, while the sum is 49.

The spelling of 18211028483821 in words is "eighteen trillion, two hundred eleven billion, twenty-eight million, four hundred eighty-three thousand, eight hundred twenty-one".