221340220444 has 72 divisors (see below), whose sum is σ = 459159049440. Its totient is φ = 93063196800.

The previous prime is 221340220433. The next prime is 221340220447. The reversal of 221340220444 is 444022043122.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221340220447) 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, 4627089 + ... + 4674679.

It is an arithmetic number, because the mean of its divisors is an integer number (6377209020).

Almost surely, 2^221340220444 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 221340220444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229579524720).

221340220444 is an abundant number, since it is smaller than the sum of its proper divisors (237818828996).

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

221340220444 is a wasteful number, since it uses less digits than its factorization.

221340220444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48059 (or 48050 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 221340220444 its reverse (444022043122), we get a palindrome (665362263566).

The spelling of 221340220444 in words is "two hundred twenty-one billion, three hundred forty million, two hundred twenty thousand, four hundred forty-four".