243211314421 has 16 divisors (see below), whose sum is σ = 253918748160. Its totient is φ = 232660153600.

The previous prime is 243211314403. The next prime is 243211314497. The reversal of 243211314421 is 124413112342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243211314421 - 2¹¹ = 243211312373 is a prime.

It is a super-3 number, since 3×243211314421³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243211314421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243211314121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9894096 + ... + 9918646.

It is an arithmetic number, because the mean of its divisors is an integer number (15869921760).

Almost surely, 2^243211314421 is an apocalyptic number.

It is an amenable number.

243211314421 is a deficient number, since it is larger than the sum of its proper divisors (10707433739).

243211314421 is a wasteful number, since it uses less digits than its factorization.

243211314421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27716.

The product of its digits is 4608, while the sum is 28.

Adding to 243211314421 its reverse (124413112342), we get a palindrome (367624426763).

The spelling of 243211314421 in words is "two hundred forty-three billion, two hundred eleven million, three hundred fourteen thousand, four hundred twenty-one".