212100220000020 has 96 divisors (see below), whose sum is σ = 648027365400576. Its totient is φ = 51405727017600.

The previous prime is 212100219999923. The next prime is 212100220000049. The reversal of 212100220000020 is 20000022001212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 212100219999960 and 212100220000005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36372604 + ... + 41799123.

It is an arithmetic number, because the mean of its divisors is an integer number (6750285056256).

Almost surely, 2^{212100220000020} is an apocalyptic number.

212100220000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212100220000020 is an abundant number, since it is smaller than the sum of its proper divisors (435927145400556).

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

212100220000020 is a wasteful number, since it uses less digits than its factorization.

212100220000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78175861 (or 78175859 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 212100220000020 its reverse (20000022001212), we get a palindrome (232100242001232).

The spelling of 212100220000020 in words is "two hundred twelve trillion, one hundred billion, two hundred twenty million, twenty", and thus it is an aban number.