221887480 has 16 divisors (see below), whose sum is σ = 499246920. Its totient is φ = 88754976.

The previous prime is 221887433. The next prime is 221887481. The reversal of 221887480 is 84788122.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 5547187 = 221887480 / (2 + 2 + 1 + 8 + 8 + 7 + 4 + 8 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221887481) 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, 2773554 + ... + 2773633.

Almost surely, 2^221887480 is an apocalyptic number.

221887480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221887480 is an abundant number, since it is smaller than the sum of its proper divisors (277359440).

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

221887480 is a wasteful number, since it uses less digits than its factorization.

221887480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5547198 (or 5547194 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 221887480 is about 14895.8880232096. Note that the first 3 decimals coincide. The cubic root of 221887480 is about 605.4025779473.

It can be divided in two parts, 2218 and 87480, that added together give a palindrome (89698).

The spelling of 221887480 in words is "two hundred twenty-one million, eight hundred eighty-seven thousand, four hundred eighty".