21422302423 has 4 divisors (see below), whose sum is σ = 21463420608. Its totient is φ = 21381184240.

The previous prime is 21422302379. The next prime is 21422302453. The reversal of 21422302423 is 32420322412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21422302423 - 2⁹ = 21422301911 is a prime.

It is a super-2 number, since 2×21422302423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422302453) 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, 20558311 + ... + 20559352.

It is an arithmetic number, because the mean of its divisors is an integer number (5365855152).

Almost surely, 2^21422302423 is an apocalyptic number.

21422302423 is a deficient number, since it is larger than the sum of its proper divisors (41118185).

21422302423 is an equidigital number, since it uses as much as digits as its factorization.

21422302423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41118184.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21422302423 its reverse (32420322412), we get a palindrome (53842624835).

The spelling of 21422302423 in words is "twenty-one billion, four hundred twenty-two million, three hundred two thousand, four hundred twenty-three".