221100212210444 has 96 divisors (see below), whose sum is σ = 458637534996480. Its totient is φ = 91252276803072.

The previous prime is 221100212210407. The next prime is 221100212210447. The reversal of 221100212210444 is 444012212001122.

It is not an unprimeable number, because it can be changed into a prime (221100212210447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500451089 + ... + 500892695.

It is an arithmetic number, because the mean of its divisors is an integer number (4777474322880).

Almost surely, 2^{221100212210444} 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 221100212210444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229318767498240).

221100212210444 is an abundant number, since it is smaller than the sum of its proper divisors (237537322786036).

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

221100212210444 is a wasteful number, since it uses less digits than its factorization.

221100212210444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443247 (or 443245 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

Adding to 221100212210444 its reverse (444012212001122), we get a palindrome (665112424211566).

The spelling of 221100212210444 in words is "two hundred twenty-one trillion, one hundred billion, two hundred twelve million, two hundred ten thousand, four hundred forty-four".