243102000021 has 4 divisors (see below), whose sum is σ = 324136000032. Its totient is φ = 162068000012.

The previous prime is 243101999977. The next prime is 243102000047. The reversal of 243102000021 is 120000201342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243102000021 - 2⁹ = 243101999509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243102000061) 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, 40517000001 + ... + 40517000006.

It is an arithmetic number, because the mean of its divisors is an integer number (81034000008).

Almost surely, 2^243102000021 is an apocalyptic number.

It is an amenable number.

243102000021 is a deficient number, since it is larger than the sum of its proper divisors (81034000011).

243102000021 is an equidigital number, since it uses as much as digits as its factorization.

243102000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81034000010.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 243102000021 its reverse (120000201342), we get a palindrome (363102201363).

The spelling of 243102000021 in words is "two hundred forty-three billion, one hundred two million, twenty-one", and thus it is an aban number.