221100000212 has 144 divisors (see below), whose sum is σ = 491551554816. Its totient is φ = 84734208000.

The previous prime is 221100000193. The next prime is 221100000217. The reversal of 221100000212 is 212000001122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221100000193 and 221100000202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100000217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92393288 + ... + 92395680.

It is an arithmetic number, because the mean of its divisors is an integer number (3413552464).

Almost surely, 2^221100000212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221100000212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245775777408).

221100000212 is an abundant number, since it is smaller than the sum of its proper divisors (270451554604).

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

221100000212 is a wasteful number, since it uses less digits than its factorization.

221100000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650 (or 2607 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221100000212 its reverse (212000001122), we get a palindrome (433100001334).

The spelling of 221100000212 in words is "two hundred twenty-one billion, one hundred million, two hundred twelve", and thus it is an aban number.