221131013101212 has 96 divisors (see below), whose sum is σ = 556858421521920. Its totient is φ = 68068564254720.

The previous prime is 221131013101073. The next prime is 221131013101223. The reversal of 221131013101212 is 212101310131122.

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 31 ways as a sum of consecutive naturals, for example, 520033 + ... + 21036455.

It is an arithmetic number, because the mean of its divisors is an integer number (5800608557520).

Almost surely, 2^{221131013101212} 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 221131013101212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278429210760960).

221131013101212 is an abundant number, since it is smaller than the sum of its proper divisors (335727408420708).

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

221131013101212 is a wasteful number, since it uses less digits than its factorization.

221131013101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20517643 (or 20517641 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 221131013101212 its reverse (212101310131122), we get a palindrome (433232323232334).

The spelling of 221131013101212 in words is "two hundred twenty-one trillion, one hundred thirty-one billion, thirteen million, one hundred one thousand, two hundred twelve".