212221222020 has 48 divisors (see below), whose sum is σ = 660243803520. Its totient is φ = 56592325728.

The previous prime is 212221222009. The next prime is 212221222027. The reversal of 212221222020 is 20222122212.

212221222020 is a `hidden beast` number, since 212 + 2 + 212 + 220 + 20 = 666.

212221222020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 212221221984 and 212221222002.

It is not an unprimeable number, because it can be changed into a prime (212221222027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196500592 + ... + 196501671.

It is an arithmetic number, because the mean of its divisors is an integer number (13755079240).

Almost surely, 2^212221222020 is an apocalyptic number.

212221222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221222020 is an abundant number, since it is smaller than the sum of its proper divisors (448022581500).

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

212221222020 is a wasteful number, since it uses less digits than its factorization.

212221222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393002281 (or 393002273 counting only the distinct ones).

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

Adding to 212221222020 its reverse (20222122212), we get a palindrome (232443344232).

The spelling of 212221222020 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty".