200423430021 has 4 divisors (see below), whose sum is σ = 267231240032. Its totient is φ = 133615620012.

The previous prime is 200423430017. The next prime is 200423430029. The reversal of 200423430021 is 120034324002.

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 not a de Polignac number, because 200423430021 - 2² = 200423430017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 200423430021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200423430029) 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, 33403905001 + ... + 33403905006.

It is an arithmetic number, because the mean of its divisors is an integer number (66807810008).

Almost surely, 2^200423430021 is an apocalyptic number.

It is an amenable number.

200423430021 is a deficient number, since it is larger than the sum of its proper divisors (66807810011).

200423430021 is an equidigital number, since it uses as much as digits as its factorization.

200423430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66807810010.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 200423430021 its reverse (120034324002), we get a palindrome (320457754023).

The spelling of 200423430021 in words is "two hundred billion, four hundred twenty-three million, four hundred thirty thousand, twenty-one".