21322143423 has 24 divisors (see below), whose sum is σ = 35202405888. Its totient is φ = 12182715792.

The previous prime is 21322143413. The next prime is 21322143457. The reversal of 21322143423 is 32434122312.

21322143423 is a `hidden beast` number, since 2 + 1 + 3 + 221 + 434 + 2 + 3 = 666.

It is not a de Polignac number, because 21322143423 - 2⁹ = 21322142911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322143413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 890790 + ... + 914412.

It is an arithmetic number, because the mean of its divisors is an integer number (1466766912).

Almost surely, 2^21322143423 is an apocalyptic number.

21322143423 is a deficient number, since it is larger than the sum of its proper divisors (13880262465).

21322143423 is a wasteful number, since it uses less digits than its factorization.

21322143423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37963 (or 37960 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21322143423 its reverse (32434122312), we get a palindrome (53756265735).

The spelling of 21322143423 in words is "twenty-one billion, three hundred twenty-two million, one hundred forty-three thousand, four hundred twenty-three".