21432356026 has 8 divisors (see below), whose sum is σ = 32149289844. Its totient is φ = 10715926080.

The previous prime is 21432355993. The next prime is 21432356027. The reversal of 21432356026 is 62065323412.

It can be written as a sum of positive squares in 2 ways, for example, as 21418029801 + 14326225 = 146349^2 + 3785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21432355982 and 21432356000.

It is not an unprimeable number, because it can be changed into a prime (21432356027) 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 3 ways as a sum of consecutive naturals, for example, 9516 + ... + 207256.

Almost surely, 2^21432356026 is an apocalyptic number.

21432356026 is a deficient number, since it is larger than the sum of its proper divisors (10716933818).

21432356026 is a wasteful number, since it uses less digits than its factorization.

21432356026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251936.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 21432356026 its reverse (62065323412), we get a palindrome (83497679438).

The spelling of 21432356026 in words is "twenty-one billion, four hundred thirty-two million, three hundred fifty-six thousand, twenty-six".