221010121212 has 48 divisors (see below), whose sum is σ = 516492547200. Its totient is φ = 73555529920.

The previous prime is 221010121207. The next prime is 221010121229. The reversal of 221010121212 is 212121010122.

It is a junction number, because it is equal to n+sod(n) for n = 221010121191 and 221010121200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23164339 + ... + 23173877.

It is an arithmetic number, because the mean of its divisors is an integer number (10760261400).

Almost surely, 2^221010121212 is an apocalyptic number.

It is an amenable number.

221010121212 is an abundant number, since it is smaller than the sum of its proper divisors (295482425988).

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

221010121212 is a wasteful number, since it uses less digits than its factorization.

221010121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12346 (or 12344 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221010121212 its reverse (212121010122), we get a palindrome (433131131334).

The spelling of 221010121212 in words is "two hundred twenty-one billion, ten million, one hundred twenty-one thousand, two hundred twelve".