212221202220 has 36 divisors (see below), whose sum is σ = 643737647280. Its totient is φ = 56592320544.

The previous prime is 212221202129. The next prime is 212221202251. The reversal of 212221202220 is 22202122212.

212221202220 is a `hidden beast` number, since 21 + 2 + 221 + 202 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 212221202193 and 212221202202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 589503160 + ... + 589503519.

Almost surely, 2^212221202220 is an apocalyptic number.

212221202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221202220 is an abundant number, since it is smaller than the sum of its proper divisors (431516445060).

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

212221202220 is a wasteful number, since it uses less digits than its factorization.

212221202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179006694 (or 1179006689 counting only the distinct ones).

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

Adding to 212221202220 its reverse (22202122212), we get a palindrome (234423324432).

The spelling of 212221202220 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred two thousand, two hundred twenty".