21122432005 has 4 divisors (see below), whose sum is σ = 25346918412. Its totient is φ = 16897945600.

The previous prime is 21122431951. The next prime is 21122432041. The reversal of 21122432005 is 50023422112.

It is a happy number.

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 12104840484 + 9017591521 = 110022^2 + 94961^2 .

It is not a de Polignac number, because 21122432005 - 2¹¹ = 21122429957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112243196 + ... + 2112243205.

It is an arithmetic number, because the mean of its divisors is an integer number (6336729603).

Almost surely, 2^21122432005 is an apocalyptic number.

It is an amenable number.

21122432005 is a deficient number, since it is larger than the sum of its proper divisors (4224486407).

21122432005 is an equidigital number, since it uses as much as digits as its factorization.

21122432005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224486406.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21122432005 its reverse (50023422112), we get a palindrome (71145854117).

The spelling of 21122432005 in words is "twenty-one billion, one hundred twenty-two million, four hundred thirty-two thousand, five".