212040220 has 48 divisors (see below), whose sum is σ = 531030528. Its totient is φ = 69537600.

The previous prime is 212040203. The next prime is 212040221. The reversal of 212040220 is 22040212.

212040220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212040220² = 89922109795296800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212040220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212040221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29706 + ... + 36145.

It is an arithmetic number, because the mean of its divisors is an integer number (11063136).

Almost surely, 2^212040220 is an apocalyptic number.

212040220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212040220 is an abundant number, since it is smaller than the sum of its proper divisors (318990308).

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

212040220 is a wasteful number, since it uses less digits than its factorization.

212040220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65890 (or 65888 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 212040220 is about 14561.6008735304. The cubic root of 212040220 is about 596.3109011069.

Adding to 212040220 its reverse (22040212), we get a palindrome (234080432).

The spelling of 212040220 in words is "two hundred twelve million, forty thousand, two hundred twenty".