212120122220 has 24 divisors (see below), whose sum is σ = 448703738784. Its totient is φ = 84228718976.

The previous prime is 212120122189. The next prime is 212120122229. The reversal of 212120122220 is 22221021212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (212120122229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38705312 + ... + 38710791.

It is an arithmetic number, because the mean of its divisors is an integer number (18695989116).

Almost surely, 2^212120122220 is an apocalyptic number.

212120122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212120122220 is an abundant number, since it is smaller than the sum of its proper divisors (236583616564).

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

212120122220 is a wasteful number, since it uses less digits than its factorization.

212120122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77416249 (or 77416247 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212120122220 its reverse (22221021212), we get a palindrome (234341143432).

The spelling of 212120122220 in words is "two hundred twelve billion, one hundred twenty million, one hundred twenty-two thousand, two hundred twenty".