21531525224005 has 32 divisors (see below), whose sum is σ = 26609903308800. Its totient is φ = 16715030937600.

The previous prime is 21531525223951. The next prime is 21531525224057. The reversal of 21531525224005 is 50042252513512.

It is not a de Polignac number, because 21531525224005 - 2¹³ = 21531525215813 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, 364855941 + ... + 364914949.

It is an arithmetic number, because the mean of its divisors is an integer number (831559478400).

Almost surely, 2^{21531525224005} is an apocalyptic number.

It is an amenable number.

21531525224005 is a deficient number, since it is larger than the sum of its proper divisors (5078378084795).

21531525224005 is a wasteful number, since it uses less digits than its factorization.

21531525224005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68565.

The product of its (nonzero) digits is 120000, while the sum is 37.

Adding to 21531525224005 its reverse (50042252513512), we get a palindrome (71573777737517).

The spelling of 21531525224005 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred twenty-five million, two hundred twenty-four thousand, five".