212111220020 has 96 divisors (see below), whose sum is σ = 527489335296. Its totient is φ = 70109942400.

The previous prime is 212111220019. The next prime is 212111220043. The reversal of 212111220020 is 20022111212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 212111219977 and 212111220004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1048505 + ... + 1234335.

It is an arithmetic number, because the mean of its divisors is an integer number (5494680576).

Almost surely, 2^212111220020 is an apocalyptic number.

212111220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212111220020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263744667648).

212111220020 is an abundant number, since it is smaller than the sum of its proper divisors (315378115276).

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

212111220020 is a wasteful number, since it uses less digits than its factorization.

212111220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186141 (or 186139 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212111220020 its reverse (20022111212), we get a palindrome (232133331232).

The spelling of 212111220020 in words is "two hundred twelve billion, one hundred eleven million, two hundred twenty thousand, twenty".