1818934021820 has 48 divisors (see below), whose sum is σ = 3842465104800. Its totient is φ = 723251992320.

The previous prime is 1818934021813. The next prime is 1818934021871. The reversal of 1818934021820 is 281204398181.

It is a super-2 number, since 2×1818934021820² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10153586 + ... + 10331174.

It is an arithmetic number, because the mean of its divisors is an integer number (80051356350).

Almost surely, 2^{1818934021820} is an apocalyptic number.

1818934021820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818934021820 is an abundant number, since it is smaller than the sum of its proper divisors (2023531082980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1818934021820 is a wasteful number, since it uses less digits than its factorization.

1818934021820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180638 (or 180636 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 47.

The spelling of 1818934021820 in words is "one trillion, eight hundred eighteen billion, nine hundred thirty-four million, twenty-one thousand, eight hundred twenty".