221043110144 has 72 divisors (see below), whose sum is σ = 454438288920. Its totient is φ = 107228233728.

The previous prime is 221043110137. The next prime is 221043110219. The reversal of 221043110144 is 441011340122.

It can be written as a sum of positive squares in 4 ways, for example, as 82575769600 + 138467340544 = 287360^2 + 372112^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3310562 + ... + 3376670.

Almost surely, 2^221043110144 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 221043110144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227219144460).

221043110144 is an abundant number, since it is smaller than the sum of its proper divisors (233395178776).

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

221043110144 is an equidigital number, since it uses as much as digits as its factorization.

221043110144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66515 (or 66501 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221043110144 its reverse (441011340122), we get a palindrome (662054450266).

The spelling of 221043110144 in words is "two hundred twenty-one billion, forty-three million, one hundred ten thousand, one hundred forty-four".