21512534120005 has 32 divisors (see below), whose sum is σ = 28958495846400. Its totient is φ = 15263540373312.

The previous prime is 21512534119969. The next prime is 21512534120047. The reversal of 21512534120005 is 50002143521512.

It is not a de Polignac number, because 21512534120005 - 2⁷ = 21512534119877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104637235 + ... + 104842624.

It is an arithmetic number, because the mean of its divisors is an integer number (904952995200).

Almost surely, 2^{21512534120005} is an apocalyptic number.

It is an amenable number.

21512534120005 is a deficient number, since it is larger than the sum of its proper divisors (7445961726395).

21512534120005 is a wasteful number, since it uses less digits than its factorization.

21512534120005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209479953.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 21512534120005 its reverse (50002143521512), we get a palindrome (71514677641517).

The spelling of 21512534120005 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty-four million, one hundred twenty thousand, five".