21234105005 has 8 divisors (see below), whose sum is σ = 25481712024. Its totient is φ = 16986760000.

The previous prime is 21234104989. The next prime is 21234105007. The reversal of 21234105005 is 50050143212.

It can be written as a sum of positive squares in 4 ways, for example, as 383611396 + 20850493609 = 19586^2 + 144397^2 .

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

It is not a de Polignac number, because 21234105005 - 2⁴ = 21234104989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234105007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258455 + ... + 330555.

It is an arithmetic number, because the mean of its divisors is an integer number (3185214003).

Almost surely, 2^21234105005 is an apocalyptic number.

It is an amenable number.

21234105005 is a deficient number, since it is larger than the sum of its proper divisors (4247607019).

21234105005 is an equidigital number, since it uses as much as digits as its factorization.

21234105005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131007.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21234105005 its reverse (50050143212), we get a palindrome (71284248217).

The spelling of 21234105005 in words is "twenty-one billion, two hundred thirty-four million, one hundred five thousand, five".