221542224 has 40 divisors (see below), whose sum is σ = 574576320. Its totient is φ = 73555968.

The previous prime is 221542183. The next prime is 221542241. The reversal of 221542224 is 422245122.

221542224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 221542194 and 221542203.

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, 3357 + ... + 21315.

It is an arithmetic number, because the mean of its divisors is an integer number (14364408).

Almost surely, 2^221542224 is an apocalyptic number.

221542224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221542224 is an abundant number, since it is smaller than the sum of its proper divisors (353034096).

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

221542224 is a wasteful number, since it uses less digits than its factorization.

221542224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18227 (or 18221 counting only the distinct ones).

The product of its digits is 2560, while the sum is 24.

The square root of 221542224 is about 14884.2945415629. The cubic root of 221542224 is about 605.0884136434.

Adding to 221542224 its reverse (422245122), we get a palindrome (643787346).

The spelling of 221542224 in words is "two hundred twenty-one million, five hundred forty-two thousand, two hundred twenty-four".