221501460 has 24 divisors (see below), whose sum is σ = 620204256. Its totient is φ = 59067040.

The previous prime is 221501453. The next prime is 221501461. The reversal of 221501460 is 64105122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221501461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1845786 + ... + 1845905.

It is an arithmetic number, because the mean of its divisors is an integer number (25841844).

Almost surely, 2^221501460 is an apocalyptic number.

221501460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221501460 is an abundant number, since it is smaller than the sum of its proper divisors (398702796).

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

221501460 is a wasteful number, since it uses less digits than its factorization.

221501460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691703 (or 3691701 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 221501460 is about 14882.9251157157. The cubic root of 221501460 is about 605.0512990675.

Adding to 221501460 its reverse (64105122), we get a palindrome (285606582).

The spelling of 221501460 in words is "two hundred twenty-one million, five hundred one thousand, four hundred sixty".