221440144 has 20 divisors (see below), whose sum is σ = 429397740. Its totient is φ = 110627840.

The previous prime is 221440133. The next prime is 221440169. The reversal of 221440144 is 441044122.

It can be written as a sum of positive squares in 2 ways, for example, as 129049600 + 92390544 = 11360^2 + 9612^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16692 + ... + 26860.

It is an arithmetic number, because the mean of its divisors is an integer number (21469887).

Almost surely, 2^221440144 is an apocalyptic number.

It is an amenable number.

221440144 is a deficient number, since it is larger than the sum of its proper divisors (207957596).

221440144 is a wasteful number, since it uses less digits than its factorization.

221440144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11538 (or 11532 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 221440144 is about 14880.8650286198. The cubic root of 221440144 is about 604.9954638460.

Adding to 221440144 its reverse (441044122), we get a palindrome (662484266).

The spelling of 221440144 in words is "two hundred twenty-one million, four hundred forty thousand, one hundred forty-four".