243130140021 has 16 divisors (see below), whose sum is σ = 341258744000. Its totient is φ = 153545321088.

The previous prime is 243130139981. The next prime is 243130140037. The reversal of 243130140021 is 120041031342.

It is not a de Polignac number, because 243130140021 - 2⁹ = 243130139509 is a prime.

It is a super-2 number, since 2×243130140021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243130140021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243130140821) 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, 735945 + ... + 1013841.

It is an arithmetic number, because the mean of its divisors is an integer number (21328671500).

Almost surely, 2^243130140021 is an apocalyptic number.

It is an amenable number.

243130140021 is a deficient number, since it is larger than the sum of its proper divisors (98128603979).

243130140021 is a wasteful number, since it uses less digits than its factorization.

243130140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293268.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 243130140021 its reverse (120041031342), we get a palindrome (363171171363).

The spelling of 243130140021 in words is "two hundred forty-three billion, one hundred thirty million, one hundred forty thousand, twenty-one".