243421189633 has 4 divisors (see below), whose sum is σ = 243520913988. Its totient is φ = 243321465280.

The previous prime is 243421189603. The next prime is 243421189639. The reversal of 243421189633 is 336981124342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 336981124342 = 2 ⋅168490562171.

It can be written as a sum of positive squares in 2 ways, for example, as 124180121664 + 119241067969 = 352392^2 + 345313^2 .

It is a cyclic number.

It is not a de Polignac number, because 243421189633 - 2¹³ = 243421181441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243421189639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49858516 + ... + 49863397.

It is an arithmetic number, because the mean of its divisors is an integer number (60880228497).

Almost surely, 2^243421189633 is an apocalyptic number.

It is an amenable number.

243421189633 is a deficient number, since it is larger than the sum of its proper divisors (99724355).

243421189633 is an equidigital number, since it uses as much as digits as its factorization.

243421189633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99724354.

The product of its digits is 746496, while the sum is 46.

The spelling of 243421189633 in words is "two hundred forty-three billion, four hundred twenty-one million, one hundred eighty-nine thousand, six hundred thirty-three".