21342144123 has 6 divisors (see below), whose sum is σ = 30827541524. Its totient is φ = 14228096076.

The previous prime is 21342144121. The next prime is 21342144167. The reversal of 21342144123 is 32144124312.

21342144123 is a `hidden beast` number, since 2 + 1 + 34 + 214 + 412 + 3 = 666.

It is not a de Polignac number, because 21342144123 - 2¹ = 21342144121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21342144121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1185674665 + ... + 1185674682.

Almost surely, 2^21342144123 is an apocalyptic number.

21342144123 is a deficient number, since it is larger than the sum of its proper divisors (9485397401).

21342144123 is a wasteful number, since it uses less digits than its factorization.

21342144123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371349353 (or 2371349350 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21342144123 its reverse (32144124312), we get a palindrome (53486268435).

The spelling of 21342144123 in words is "twenty-one billion, three hundred forty-two million, one hundred forty-four thousand, one hundred twenty-three".