21432323113 has 4 divisors (see below), whose sum is σ = 22693048020. Its totient is φ = 20171598208.

The previous prime is 21432323111. The next prime is 21432323131. The reversal of 21432323113 is 31132323412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8849541184 + 12582781929 = 94072^2 + 112173^2 .

It is a cyclic number.

It is not a de Polignac number, because 21432323113 - 2¹ = 21432323111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432323111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630362428 + ... + 630362461.

It is an arithmetic number, because the mean of its divisors is an integer number (5673262005).

Almost surely, 2^21432323113 is an apocalyptic number.

It is an amenable number.

21432323113 is a deficient number, since it is larger than the sum of its proper divisors (1260724907).

21432323113 is a wasteful number, since it uses less digits than its factorization.

21432323113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260724906.

The product of its digits is 2592, while the sum is 25.

Adding to 21432323113 its reverse (31132323412), we get a palindrome (52564646525).

The spelling of 21432323113 in words is "twenty-one billion, four hundred thirty-two million, three hundred twenty-three thousand, one hundred thirteen".