243140143521 has 96 divisors (see below), whose sum is σ = 382209408000. Its totient is φ = 135969390720.

The previous prime is 243140143517. The next prime is 243140143531. The reversal of 243140143521 is 125341041342.

It is not a de Polignac number, because 243140143521 - 2² = 243140143517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243140143531) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 483379756 + ... + 483380258.

It is an arithmetic number, because the mean of its divisors is an integer number (3981348000).

Almost surely, 2^243140143521 is an apocalyptic number.

It is an amenable number.

243140143521 is a deficient number, since it is larger than the sum of its proper divisors (139069264479).

243140143521 is a wasteful number, since it uses less digits than its factorization.

243140143521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 243140143521 its reverse (125341041342), we get a palindrome (368481184863).

The spelling of 243140143521 in words is "two hundred forty-three billion, one hundred forty million, one hundred forty-three thousand, five hundred twenty-one".