221220022212 has 96 divisors (see below), whose sum is σ = 678069100800. Its totient is φ = 61026206976.

The previous prime is 221220022181. The next prime is 221220022213. The reversal of 221220022212 is 212220022122.

221220022212 is a `hidden beast` number, since 221 + 220 + 0 + 2 + 221 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221220022213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5023233 + ... + 5067080.

It is an arithmetic number, because the mean of its divisors is an integer number (7063219800).

Almost surely, 2^221220022212 is an apocalyptic number.

It is an amenable number.

221220022212 is an abundant number, since it is smaller than the sum of its proper divisors (456849078588).

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

221220022212 is a wasteful number, since it uses less digits than its factorization.

221220022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10090362 (or 10090354 counting only the distinct ones).

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

Adding to 221220022212 its reverse (212220022122), we get a palindrome (433440044334).

The spelling of 221220022212 in words is "two hundred twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred twelve".