221324124 has 96 divisors (see below), whose sum is σ = 622734336. Its totient is φ = 59811840.

The previous prime is 221324119. The next prime is 221324161. The reversal of 221324124 is 421423122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 221324124.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 186814 + ... + 187994.

It is an arithmetic number, because the mean of its divisors is an integer number (6486816).

Almost surely, 2^221324124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221324124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311367168).

221324124 is an abundant number, since it is smaller than the sum of its proper divisors (401410212).

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

221324124 is a wasteful number, since it uses less digits than its factorization.

221324124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315 (or 1313 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 221324124 is about 14876.9662229905. The cubic root of 221324124 is about 604.8897861752.

Adding to 221324124 its reverse (421423122), we get a palindrome (642747246).

The spelling of 221324124 in words is "two hundred twenty-one million, three hundred twenty-four thousand, one hundred twenty-four".