1818382002021 has 12 divisors (see below), whose sum is σ = 2828594225548. Its totient is φ = 1119004308864.

The previous prime is 1818382002007. The next prime is 1818382002071. The reversal of 1818382002021 is 1202002838181.

It can be written as a sum of positive squares in 2 ways, for example, as 69941736225 + 1748440265796 = 264465^2 + 1322286^2 .

It is not a de Polignac number, because 1818382002021 - 2²⁵ = 1818348447589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818382002001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7770863140 + ... + 7770863373.

Almost surely, 2^{1818382002021} is an apocalyptic number.

It is an amenable number.

1818382002021 is a deficient number, since it is larger than the sum of its proper divisors (1010212223527).

1818382002021 is a wasteful number, since it uses less digits than its factorization.

1818382002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15541726532 (or 15541726529 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The spelling of 1818382002021 in words is "one trillion, eight hundred eighteen billion, three hundred eighty-two million, two thousand, twenty-one".