212202220 has 24 divisors (see below), whose sum is σ = 446043024. Its totient is φ = 84801216.

The previous prime is 212202191. The next prime is 212202229. The reversal of 212202220 is 22202212.

It is a self number, because there is not a number n which added to its sum of digits gives 212202220.

It is not an unprimeable number, because it can be changed into a prime (212202229) 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, 19887 + ... + 28633.

It is an arithmetic number, because the mean of its divisors is an integer number (18585126).

Almost surely, 2^212202220 is an apocalyptic number.

212202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212202220 is an abundant number, since it is smaller than the sum of its proper divisors (233840804).

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

212202220 is a wasteful number, since it uses less digits than its factorization.

212202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9969 (or 9967 counting only the distinct ones).

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

The square root of 212202220 is about 14567.1623866833. The cubic root of 212202220 is about 596.4627241507.

Adding to 212202220 its reverse (22202212), we get a palindrome (234404432).

The spelling of 212202220 in words is "two hundred twelve million, two hundred two thousand, two hundred twenty".