21521001130005 has 64 divisors (see below), whose sum is σ = 37232171665920. Its totient is φ = 10552164642816.

The previous prime is 21521001129959. The next prime is 21521001130151. The reversal of 21521001130005 is 50003110012512.

It is not a de Polignac number, because 21521001130005 - 2¹³ = 21521001121813 is a prime.

It is a super-2 number, since 2×21521001130005² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 226067977 + ... + 226163153.

It is an arithmetic number, because the mean of its divisors is an integer number (581752682280).

Almost surely, 2^{21521001130005} is an apocalyptic number.

It is an amenable number.

21521001130005 is a deficient number, since it is larger than the sum of its proper divisors (15711170535915).

21521001130005 is a wasteful number, since it uses less digits than its factorization.

21521001130005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99870.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 21521001130005 its reverse (50003110012512), we get a palindrome (71524111142517).

The spelling of 21521001130005 in words is "twenty-one trillion, five hundred twenty-one billion, one million, one hundred thirty thousand, five".