185821130100 has 72 divisors (see below), whose sum is σ = 538997078368. Its totient is φ = 49427452800.

The previous prime is 185821130083. The next prime is 185821130141. The reversal of 185821130100 is 1031128581.

It is a super-2 number, since 2×185821130100² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 661006 + ... + 899205.

Almost surely, 2^185821130100 is an apocalyptic number.

185821130100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

185821130100 is an abundant number, since it is smaller than the sum of its proper divisors (353175948268).

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

185821130100 is a wasteful number, since it uses less digits than its factorization.

185821130100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560625 (or 1560618 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

Adding to 185821130100 its reverse (1031128581), we get a palindrome (186852258681).

The spelling of 185821130100 in words is "one hundred eighty-five billion, eight hundred twenty-one million, one hundred thirty thousand, one hundred".