21432422123 has 16 divisors (see below), whose sum is σ = 26412234240. Its totient is φ = 16979284800.

The previous prime is 21432422117. The next prime is 21432422153. The reversal of 21432422123 is 32122423412.

It is a cyclic number.

It is not a de Polignac number, because 21432422123 - 2¹⁴ = 21432405739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21432422092 and 21432422101.

It is not an unprimeable number, because it can be changed into a prime (21432422113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1959743 + ... + 1970648.

It is an arithmetic number, because the mean of its divisors is an integer number (1650764640).

Almost surely, 2^21432422123 is an apocalyptic number.

21432422123 is a deficient number, since it is larger than the sum of its proper divisors (4979812117).

21432422123 is a wasteful number, since it uses less digits than its factorization.

21432422123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3930458.

The product of its digits is 4608, while the sum is 26.

Adding to 21432422123 its reverse (32122423412), we get a palindrome (53554845535).

The spelling of 21432422123 in words is "twenty-one billion, four hundred thirty-two million, four hundred twenty-two thousand, one hundred twenty-three".