243313421 has 8 divisors (see below), whose sum is σ = 265188000. Its totient is φ = 221890032.

The previous prime is 243313403. The next prime is 243313423. The reversal of 243313421 is 124313342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-243313421 is a prime.

It is a super-4 number, since 4×243313421⁴ (a number of 35 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243313423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111671 + ... + 113828.

It is an arithmetic number, because the mean of its divisors is an integer number (33148500).

Almost surely, 2^243313421 is an apocalyptic number.

It is an amenable number.

243313421 is a deficient number, since it is larger than the sum of its proper divisors (21874579).

243313421 is a wasteful number, since it uses less digits than its factorization.

243313421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225595.

The product of its digits is 1728, while the sum is 23.

The square root of 243313421 is about 15598.5070118906. The cubic root of 243313421 is about 624.2933205211.

Adding to 243313421 its reverse (124313342), we get a palindrome (367626763).

The spelling of 243313421 in words is "two hundred forty-three million, three hundred thirteen thousand, four hundred twenty-one".