12181920273820 has 96 divisors (see below), whose sum is σ = 28984529064960. Its totient is φ = 4262054442240.

The previous prime is 12181920273791. The next prime is 12181920273821. The reversal of 12181920273820 is 2837202918121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181920273821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9374139 + ... + 10594258.

It is an arithmetic number, because the mean of its divisors is an integer number (301922177760).

Almost surely, 2^{12181920273820} is an apocalyptic number.

12181920273820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12181920273820 is an abundant number, since it is smaller than the sum of its proper divisors (16802608791140).

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

12181920273820 is a wasteful number, since it uses less digits than its factorization.

12181920273820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19968523 (or 19968521 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 12181920273820 in words is "twelve trillion, one hundred eighty-one billion, nine hundred twenty million, two hundred seventy-three thousand, eight hundred twenty".