212122220 has 48 divisors (see below), whose sum is σ = 453212928. Its totient is φ = 83385600.

The previous prime is 212122199. The next prime is 212122237. The reversal of 212122220 is 22221212.

212122220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 212122195 and 212122204.

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, 349157 + ... + 349763.

It is an arithmetic number, because the mean of its divisors is an integer number (9441936).

Almost surely, 2^212122220 is an apocalyptic number.

212122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212122220 is an abundant number, since it is smaller than the sum of its proper divisors (241090708).

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

212122220 is a wasteful number, since it uses less digits than its factorization.

212122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 212122220 is about 14564.4162258568. The cubic root of 212122220 is about 596.3877594690.

Adding to 212122220 its reverse (22221212), we get a palindrome (234343432).

It can be divided in two parts, 21212 and 2220, that added together give a palindrome (23432).

The spelling of 212122220 in words is "two hundred twelve million, one hundred twenty-two thousand, two hundred twenty".