23521521005 has 8 divisors (see below), whose sum is σ = 28688544024. Its totient is φ = 18508737600.

The previous prime is 23521520987. The next prime is 23521521013. The reversal of 23521521005 is 50012512532.

It can be written as a sum of positive squares in 4 ways, for example, as 3009839044 + 20511681961 = 54862^2 + 143219^2 .

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

It is not a de Polignac number, because 23521521005 - 2¹⁴ = 23521504621 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 7 ways as a sum of consecutive naturals, for example, 38559566 + ... + 38560175.

It is an arithmetic number, because the mean of its divisors is an integer number (3586068003).

Almost surely, 2^23521521005 is an apocalyptic number.

It is an amenable number.

23521521005 is a deficient number, since it is larger than the sum of its proper divisors (5167023019).

23521521005 is an equidigital number, since it uses as much as digits as its factorization.

23521521005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77119807.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 23521521005 in words is "twenty-three billion, five hundred twenty-one million, five hundred twenty-one thousand, five".