221125504 has 32 divisors (see below), whose sum is σ = 442855440. Its totient is φ = 109977600.

The previous prime is 221125501. The next prime is 221125507. The reversal of 221125504 is 405521122.

It is an interprime number because it is at equal distance from previous prime (221125501) and next prime (221125507).

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221125501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20229 + ... + 29179.

Almost surely, 2^221125504 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 221125504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221427720).

221125504 is an abundant number, since it is smaller than the sum of its proper divisors (221729936).

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

221125504 is an equidigital number, since it uses as much as digits as its factorization.

221125504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9158 (or 9146 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 221125504 is about 14870.2893045159. The cubic root of 221125504 is about 604.7087859231.

Adding to 221125504 its reverse (405521122), we get a palindrome (626646626).

The spelling of 221125504 in words is "two hundred twenty-one million, one hundred twenty-five thousand, five hundred four".