221125440 has 56 divisors (see below), whose sum is σ = 702076320. Its totient is φ = 58966528.

The previous prime is 221125369. The next prime is 221125481. The reversal of 221125440 is 44521122.

It is a congruent number.

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, 114210 + ... + 116129.

Almost surely, 2^221125440 is an apocalyptic number.

221125440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221125440 is an abundant number, since it is smaller than the sum of its proper divisors (480950880).

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

221125440 is a wasteful number, since it uses less digits than its factorization.

221125440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230359 (or 230349 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221125440 is about 14870.2871525738. The cubic root of 221125440 is about 604.7087275831.

Adding to 221125440 its reverse (44521122), we get a palindrome (265646562).

The spelling of 221125440 in words is "two hundred twenty-one million, one hundred twenty-five thousand, four hundred forty".