243202420123 has 4 divisors (see below), whose sum is σ = 261910298608. Its totient is φ = 224494541640.

The previous prime is 243202420117. The next prime is 243202420127. The reversal of 243202420123 is 321024202342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243202420123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243202420127) 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, 9353939223 + ... + 9353939248.

It is an arithmetic number, because the mean of its divisors is an integer number (65477574652).

Almost surely, 2^243202420123 is an apocalyptic number.

243202420123 is a deficient number, since it is larger than the sum of its proper divisors (18707878485).

243202420123 is a wasteful number, since it uses less digits than its factorization.

243202420123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18707878484.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 243202420123 its reverse (321024202342), we get a palindrome (564226622465).

The spelling of 243202420123 in words is "two hundred forty-three billion, two hundred two million, four hundred twenty thousand, one hundred twenty-three".