212122022220 has 36 divisors (see below), whose sum is σ = 643436801280. Its totient is φ = 56565872544.

The previous prime is 212122022213. The next prime is 212122022293. The reversal of 212122022220 is 22220221212.

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 = 212122022193 and 212122022202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 589227660 + ... + 589228019.

It is an arithmetic number, because the mean of its divisors is an integer number (17873244480).

Almost surely, 2^212122022220 is an apocalyptic number.

212122022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212122022220 is an abundant number, since it is smaller than the sum of its proper divisors (431314779060).

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

212122022220 is a wasteful number, since it uses less digits than its factorization.

212122022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178455694 (or 1178455689 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212122022220 its reverse (22220221212), we get a palindrome (234342243432).

The spelling of 212122022220 in words is "two hundred twelve billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty".