221221202244 has 192 divisors, whose sum is σ = 625788688896. Its totient is φ = 59507675136.

The previous prime is 221221202227. The next prime is 221221202261. The reversal of 221221202244 is 442202122122.

It is an interprime number because it is at equal distance from previous prime (221221202227) and next prime (221221202261).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12015654 + ... + 12034050.

It is an arithmetic number, because the mean of its divisors is an integer number (3259316088).

Almost surely, 2^221221202244 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 221221202244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312894344448).

221221202244 is an abundant number, since it is smaller than the sum of its proper divisors (404567486652).

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

221221202244 is a wasteful number, since it uses less digits than its factorization.

221221202244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18574 (or 18572 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 221221202244 its reverse (442202122122), we get a palindrome (663423324366).

The spelling of 221221202244 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, two hundred forty-four".