221011212112 has 20 divisors (see below), whose sum is σ = 453398001876. Its totient is φ = 104005276160.

The previous prime is 221011212101. The next prime is 221011212119. The reversal of 221011212112 is 211212110122.

It can be written as a sum of positive squares in 2 ways, for example, as 196873239616 + 24137972496 = 443704^2 + 155364^2 .

It is a super-3 number, since 3×221011212112³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011212119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406270339 + ... + 406270882.

Almost surely, 2^221011212112 is an apocalyptic number.

It is an amenable number.

221011212112 is an abundant number, since it is smaller than the sum of its proper divisors (232386789764).

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

221011212112 is a wasteful number, since it uses less digits than its factorization.

221011212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812541246 (or 812541240 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221011212112 its reverse (211212110122), we get a palindrome (432223322234).

The spelling of 221011212112 in words is "two hundred twenty-one billion, eleven million, two hundred twelve thousand, one hundred twelve".