21425432423 has 2 divisors, whose sum is σ = 21425432424. Its totient is φ = 21425432422.

The previous prime is 21425432419. The next prime is 21425432437. The reversal of 21425432423 is 32423452412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21425432423 - 2² = 21425432419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21425432423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21425432323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712716211 + 10712716212.

It is an arithmetic number, because the mean of its divisors is an integer number (10712716212).

Almost surely, 2^21425432423 is an apocalyptic number.

21425432423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425432423 is an equidigital number, since it uses as much as digits as its factorization.

21425432423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 32.

Adding to 21425432423 its reverse (32423452412), we get a palindrome (53848884835).

The spelling of 21425432423 in words is "twenty-one billion, four hundred twenty-five million, four hundred thirty-two thousand, four hundred twenty-three".