243421003523 has 4 divisors (see below), whose sum is σ = 243423481728. Its totient is φ = 243418525320.

The previous prime is 243421003471. The next prime is 243421003543. The reversal of 243421003523 is 325300124342.

It is a happy number.

243421003523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325300124342 = 2 ⋅162650062171.

It is a cyclic number.

It is not a de Polignac number, because 243421003523 - 2²² = 243416809219 is a prime.

It is a super-2 number, since 2×243421003523² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243421003543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085411 + ... + 1290332.

It is an arithmetic number, because the mean of its divisors is an integer number (60855870432).

Almost surely, 2^243421003523 is an apocalyptic number.

243421003523 is a deficient number, since it is larger than the sum of its proper divisors (2478205).

243421003523 is a wasteful number, since it uses less digits than its factorization.

243421003523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478204.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 243421003523 its reverse (325300124342), we get a palindrome (568721127865).

The spelling of 243421003523 in words is "two hundred forty-three billion, four hundred twenty-one million, three thousand, five hundred twenty-three".