221641043412 has 96 divisors (see below), whose sum is σ = 559606924800. Its totient is φ = 68023867392.

The previous prime is 221641043399. The next prime is 221641043413. The reversal of 221641043412 is 214340146122.

221641043412 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221641043412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221641043413) by changing a digit.

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, 1693558 + ... + 1819730.

It is an arithmetic number, because the mean of its divisors is an integer number (5829238800).

Almost surely, 2^221641043412 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 221641043412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279803462400).

221641043412 is an abundant number, since it is smaller than the sum of its proper divisors (337965881388).

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

221641043412 is a wasteful number, since it uses less digits than its factorization.

221641043412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126385 (or 126383 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 221641043412 its reverse (214340146122), we get a palindrome (435981189534).

The spelling of 221641043412 in words is "two hundred twenty-one billion, six hundred forty-one million, forty-three thousand, four hundred twelve".