221102302212 has 120 divisors (see below), whose sum is σ = 631350276480. Its totient is φ = 66915771840.

The previous prime is 221102302181. The next prime is 221102302229. The reversal of 221102302212 is 212203201122.

221102302212 is a `hidden beast` number, since 2 + 211 + 0 + 230 + 221 + 2 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2801589 + ... + 2879427.

It is an arithmetic number, because the mean of its divisors is an integer number (5261252304).

Almost surely, 2^221102302212 is an apocalyptic number.

221102302212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221102302212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315675138240).

221102302212 is an abundant number, since it is smaller than the sum of its proper divisors (410247974268).

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

221102302212 is a wasteful number, since it uses less digits than its factorization.

221102302212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78663 (or 78652 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 221102302212 its reverse (212203201122), we get a palindrome (433305503334).

The spelling of 221102302212 in words is "two hundred twenty-one billion, one hundred two million, three hundred two thousand, two hundred twelve".