212789555820 has 96 divisors (see below), whose sum is σ = 683367229440. Its totient is φ = 54913429440.

The previous prime is 212789555743. The next prime is 212789555827. The reversal of 212789555820 is 28555987212.

212789555820 is a `hidden beast` number, since 2 + 1 + 2 + 7 + 8 + 9 + 55 + 582 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (212789555827) 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, 6338982 + ... + 6372461.

It is an arithmetic number, because the mean of its divisors is an integer number (7118408640).

Almost surely, 2^212789555820 is an apocalyptic number.

212789555820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212789555820 is an abundant number, since it is smaller than the sum of its proper divisors (470577673620).

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

212789555820 is a wasteful number, since it uses less digits than its factorization.

212789555820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12711492 (or 12711484 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 54.

The spelling of 212789555820 in words is "two hundred twelve billion, seven hundred eighty-nine million, five hundred fifty-five thousand, eight hundred twenty".