21230330423 has 2 divisors, whose sum is σ = 21230330424. Its totient is φ = 21230330422.

The previous prime is 21230330419. The next prime is 21230330449. The reversal of 21230330423 is 32403303212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230330423 - 2² = 21230330419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230330413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615165211 + 10615165212.

It is an arithmetic number, because the mean of its divisors is an integer number (10615165212).

Almost surely, 2^21230330423 is an apocalyptic number.

21230330423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230330423 is an equidigital number, since it uses as much as digits as its factorization.

21230330423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21230330423 its reverse (32403303212), we get a palindrome (53633633635).

The spelling of 21230330423 in words is "twenty-one billion, two hundred thirty million, three hundred thirty thousand, four hundred twenty-three".