221444343340 has 72 divisors (see below), whose sum is σ = 511379084160. Its totient is φ = 80489460480.

The previous prime is 221444343313. The next prime is 221444343347. The reversal of 221444343340 is 43343444122.

It is a junction number, because it is equal to n+sod(n) for n = 221444343296 and 221444343305.

It is not an unprimeable number, because it can be changed into a prime (221444343347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5771941 + ... + 5810179.

It is an arithmetic number, because the mean of its divisors is an integer number (7102487280).

Almost surely, 2^221444343340 is an apocalyptic number.

221444343340 is a gapful number since it is divisible by the number (20) 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 221444343340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255689542080).

221444343340 is an abundant number, since it is smaller than the sum of its proper divisors (289934740820).

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

221444343340 is a wasteful number, since it uses less digits than its factorization.

221444343340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40663 (or 40650 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 34.

Adding to 221444343340 its reverse (43343444122), we get a palindrome (264787787462).

The spelling of 221444343340 in words is "two hundred twenty-one billion, four hundred forty-four million, three hundred forty-three thousand, three hundred forty".