21342235423 has 2 divisors, whose sum is σ = 21342235424. Its totient is φ = 21342235422.

The previous prime is 21342235403. The next prime is 21342235427. The reversal of 21342235423 is 32453224312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21342235423 - 2²¹ = 21340138271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342235427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671117711 + 10671117712.

It is an arithmetic number, because the mean of its divisors is an integer number (10671117712).

Almost surely, 2^21342235423 is an apocalyptic number.

21342235423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342235423 is an equidigital number, since it uses as much as digits as its factorization.

21342235423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 31.

Adding to 21342235423 its reverse (32453224312), we get a palindrome (53795459735).

The spelling of 21342235423 in words is "twenty-one billion, three hundred forty-two million, two hundred thirty-five thousand, four hundred twenty-three".