212666220 has 108 divisors (see below), whose sum is σ = 698626656. Its totient is φ = 52341120.

The previous prime is 212666203. The next prime is 212666227. The reversal of 212666220 is 22666212.

212666220 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 2×212666220² = 90453842258176800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212666227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26925 + ... + 33915.

Almost surely, 2^212666220 is an apocalyptic number.

212666220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212666220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349313328).

212666220 is an abundant number, since it is smaller than the sum of its proper divisors (485960436).

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

212666220 is a wasteful number, since it uses less digits than its factorization.

212666220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032 (or 7014 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 212666220 is about 14583.0799216078. The cubic root of 212666220 is about 596.8971481781.

The spelling of 212666220 in words is "two hundred twelve million, six hundred sixty-six thousand, two hundred twenty".