243154523421 has 12 divisors (see below), whose sum is σ = 353043012348. Its totient is φ = 161263102464.

The previous prime is 243154523411. The next prime is 243154523473. The reversal of 243154523421 is 124325451342.

It is a happy number.

243154523421 is a `hidden beast` number, since 2 + 43 + 1 + 54 + 523 + 42 + 1 = 666.

243154523421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 43425975321 + 199728548100 = 208389^2 + 446910^2 .

It is not a de Polignac number, because 243154523421 - 2⁵ = 243154523389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243154523401) 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 11 ways as a sum of consecutive naturals, for example, 69990930 + ... + 69994403.

It is an arithmetic number, because the mean of its divisors is an integer number (29420251029).

Almost surely, 2^243154523421 is an apocalyptic number.

It is an amenable number.

243154523421 is a deficient number, since it is larger than the sum of its proper divisors (109888488927).

243154523421 is a wasteful number, since it uses less digits than its factorization.

243154523421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139985532 (or 139985529 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 243154523421 its reverse (124325451342), we get a palindrome (367479974763).

The spelling of 243154523421 in words is "two hundred forty-three billion, one hundred fifty-four million, five hundred twenty-three thousand, four hundred twenty-one".