221222200212 has 72 divisors (see below), whose sum is σ = 602277532584. Its totient is φ = 68061413376.

The previous prime is 221222200139. The next prime is 221222200219. The reversal of 221222200212 is 212002222122.

221222200212 is a `hidden beast` number, since 221 + 222 + 200 + 21 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 431226756 + 220790973456 = 20766^2 + 469884^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222200219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6362908 + ... + 6397580.

Almost surely, 2^221222200212 is an apocalyptic number.

It is an amenable number.

221222200212 is an abundant number, since it is smaller than the sum of its proper divisors (381055332372).

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

221222200212 is a wasteful number, since it uses less digits than its factorization.

221222200212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48329 (or 48324 counting only the distinct ones).

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

Adding to 221222200212 its reverse (212002222122), we get a palindrome (433224422334).

The spelling of 221222200212 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred thousand, two hundred twelve".