212220220221 has 12 divisors (see below), whose sum is σ = 306548912800. Its totient is φ = 141476180040.

The previous prime is 212220220207. The next prime is 212220220259. The reversal of 212220220221 is 122022022212.

212220220221 is a `hidden beast` number, since 2 + 1 + 2 + 220 + 220 + 221 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-212220220221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212220220194 and 212220220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220220271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28830 + ... + 652128.

Almost surely, 2^212220220221 is an apocalyptic number.

It is an amenable number.

212220220221 is a deficient number, since it is larger than the sum of its proper divisors (94328692579).

212220220221 is a wasteful number, since it uses less digits than its factorization.

212220220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661136 (or 661133 counting only the distinct ones).

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

Adding to 212220220221 its reverse (122022022212), we get a palindrome (334242242433).

The spelling of 212220220221 in words is "two hundred twelve billion, two hundred twenty million, two hundred twenty thousand, two hundred twenty-one".