221424040 has 32 divisors (see below), whose sum is σ = 498987360. Its totient is φ = 88430400.

The previous prime is 221424029. The next prime is 221424061. The reversal of 221424040 is 40424122.

It is a junction number, because it is equal to n+sod(n) for n = 221423999 and 221424017.

It is an unprimeable number.

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, 23635 + ... + 31645.

It is an arithmetic number, because the mean of its divisors is an integer number (15593355).

Almost surely, 2^221424040 is an apocalyptic number.

221424040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221424040 is an abundant number, since it is smaller than the sum of its proper divisors (277563320).

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

221424040 is a wasteful number, since it uses less digits than its factorization.

221424040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8713 (or 8709 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 221424040 is about 14880.3239212055. The cubic root of 221424040 is about 604.9807976056.

Adding to 221424040 its reverse (40424122), we get a palindrome (261848162).

The spelling of 221424040 in words is "two hundred twenty-one million, four hundred twenty-four thousand, forty".