21232407605 has 8 divisors (see below), whose sum is σ = 25641175992. Its totient is φ = 16877734848.

The previous prime is 21232407589. The next prime is 21232407613. The reversal of 21232407605 is 50670423212.

It can be written as a sum of positive squares in 4 ways, for example, as 403567921 + 20828839684 = 20089^2 + 144322^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21232407605 - 2⁴ = 21232407589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13523042 + ... + 13524611.

It is an arithmetic number, because the mean of its divisors is an integer number (3205146999).

Almost surely, 2^21232407605 is an apocalyptic number.

It is an amenable number.

21232407605 is a deficient number, since it is larger than the sum of its proper divisors (4408768387).

21232407605 is a wasteful number, since it uses less digits than its factorization.

21232407605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27047815.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 21232407605 in words is "twenty-one billion, two hundred thirty-two million, four hundred seven thousand, six hundred five".