212111202220020 has 36 divisors (see below), whose sum is σ = 643403980067940. Its totient is φ = 56562987258624.

The previous prime is 212111202219977. The next prime is 212111202220031. The reversal of 212111202220020 is 20022202111212.

It is a happy number.

212111202220020 is a `hidden beast` number, since 212 + 1 + 11 + 202 + 220 + 0 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 153397786368996 + 58713415851024 = 12385386^2 + 7662468^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 212111202219975 and 212111202220002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 589197783765 + ... + 589197784124.

It is an arithmetic number, because the mean of its divisors is an integer number (17872332779665).

Almost surely, 2^{212111202220020} is an apocalyptic number.

212111202220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212111202220020 is an abundant number, since it is smaller than the sum of its proper divisors (431292777847920).

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

212111202220020 is a wasteful number, since it uses less digits than its factorization.

212111202220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178395567904 (or 1178395567899 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212111202220020 its reverse (20022202111212), we get a palindrome (232133404331232).

The spelling of 212111202220020 in words is "two hundred twelve trillion, one hundred eleven billion, two hundred two million, two hundred twenty thousand, twenty".