20230430021 has 2 divisors, whose sum is σ = 20230430022. Its totient is φ = 20230430020.

The previous prime is 20230430009. The next prime is 20230430057. The reversal of 20230430021 is 12003403202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20100150625 + 130279396 = 141775^2 + 11414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20230430021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20230430071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10115215010 + 10115215011.

It is an arithmetic number, because the mean of its divisors is an integer number (10115215011).

Almost surely, 2^20230430021 is an apocalyptic number.

It is an amenable number.

20230430021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20230430021 is an equidigital number, since it uses as much as digits as its factorization.

20230430021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20230430021 its reverse (12003403202), we get a palindrome (32233833223).

The spelling of 20230430021 in words is "twenty billion, two hundred thirty million, four hundred thirty thousand, twenty-one".