221110101212 has 192 divisors, whose sum is σ = 548327592960. Its totient is φ = 75134822400.

The previous prime is 221110101181. The next prime is 221110101227. The reversal of 221110101212 is 212101011122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30198512 + ... + 30205832.

It is an arithmetic number, because the mean of its divisors is an integer number (2855872880).

Almost surely, 2^221110101212 is an apocalyptic number.

221110101212 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 221110101212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274163796480).

221110101212 is an abundant number, since it is smaller than the sum of its proper divisors (327217491748).

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

221110101212 is a wasteful number, since it uses less digits than its factorization.

221110101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7772 (or 7770 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221110101212 its reverse (212101011122), we get a palindrome (433211112334).

The spelling of 221110101212 in words is "two hundred twenty-one billion, one hundred ten million, one hundred one thousand, two hundred twelve".