212221200021020 has 24 divisors (see below), whose sum is σ = 446024798608704. Its totient is φ = 84819855519936.

The previous prime is 212221200021013. The next prime is 212221200021023. The reversal of 212221200021020 is 20120002122212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 212221200021020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221200021023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4289005172 + ... + 4289054651.

It is an arithmetic number, because the mean of its divisors is an integer number (18584366608696).

Almost surely, 2^{212221200021020} is an apocalyptic number.

212221200021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221200021020 is an abundant number, since it is smaller than the sum of its proper divisors (233803598587684).

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

212221200021020 is a wasteful number, since it uses less digits than its factorization.

212221200021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8578061069 (or 8578061067 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212221200021020 its reverse (20120002122212), we get a palindrome (232341202143232).

The spelling of 212221200021020 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred million, twenty-one thousand, twenty".