212120111220 has 48 divisors (see below), whose sum is σ = 625196120640. Its totient is φ = 53588238336.

The previous prime is 212120111219. The next prime is 212120111233. The reversal of 212120111220 is 22111021212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 212120111220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93033997 + ... + 93036276.

It is an arithmetic number, because the mean of its divisors is an integer number (13024919180).

Almost surely, 2^212120111220 is an apocalyptic number.

212120111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212120111220 is an abundant number, since it is smaller than the sum of its proper divisors (413076009420).

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

212120111220 is a wasteful number, since it uses less digits than its factorization.

212120111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186070304 (or 186070302 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212120111220 its reverse (22111021212), we get a palindrome (234231132432).

The spelling of 212120111220 in words is "two hundred twelve billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty".