243221424 has 40 divisors (see below), whose sum is σ = 645308400. Its totient is φ = 78882048.

The previous prime is 243221411. The next prime is 243221437. The reversal of 243221424 is 424122342.

It is an interprime number because it is at equal distance from previous prime (243221411) and next prime (243221437).

It is a super-2 number, since 2×243221424² = 118313322185175552, which contains 22 as substring.

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

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

It is a junction number, because it is equal to n+sod(n) for n = 243221394 and 243221403.

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, 66699 + ... + 70250.

It is an arithmetic number, because the mean of its divisors is an integer number (16132710).

Almost surely, 2^243221424 is an apocalyptic number.

243221424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

243221424 is an abundant number, since it is smaller than the sum of its proper divisors (402086976).

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

243221424 is a wasteful number, since it uses less digits than its factorization.

243221424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136997 (or 136991 counting only the distinct ones).

The product of its digits is 3072, while the sum is 24.

The square root of 243221424 is about 15595.5578290743. The cubic root of 243221424 is about 624.2146286670.

Adding to 243221424 its reverse (424122342), we get a palindrome (667343766).

The spelling of 243221424 in words is "two hundred forty-three million, two hundred twenty-one thousand, four hundred twenty-four".