212101211220 has 48 divisors (see below), whose sum is σ = 593906913600. Its totient is φ = 56558082816.

The previous prime is 212101211209. The next prime is 212101211221. The reversal of 212101211220 is 22112101212.

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 212101211220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101211221) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1929459 + ... + 2036421.

It is an arithmetic number, because the mean of its divisors is an integer number (12373060700).

Almost surely, 2^212101211220 is an apocalyptic number.

212101211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212101211220 is an abundant number, since it is smaller than the sum of its proper divisors (381805702380).

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

212101211220 is a wasteful number, since it uses less digits than its factorization.

212101211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140024 (or 140022 counting only the distinct ones).

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

Adding to 212101211220 its reverse (22112101212), we get a palindrome (234213312432).

The spelling of 212101211220 in words is "two hundred twelve billion, one hundred one million, two hundred eleven thousand, two hundred twenty".