21520003022105 has 24 divisors (see below), whose sum is σ = 30041530727040. Its totient is φ = 14755903837920.

The previous prime is 21520003022099. The next prime is 21520003022191. The reversal of 21520003022105 is 50122030002512.

It is not a de Polignac number, because 21520003022105 - 2¹² = 21520003018009 is a prime.

It is a super-2 number, since 2×21520003022105² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3446990 + ... + 7410920.

It is an arithmetic number, because the mean of its divisors is an integer number (1251730446960).

Almost surely, 2^{21520003022105} is an apocalyptic number.

It is an amenable number.

21520003022105 is a deficient number, since it is larger than the sum of its proper divisors (8521527704935).

21520003022105 is a wasteful number, since it uses less digits than its factorization.

21520003022105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986109 (or 3986102 counting only the distinct ones).

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

Adding to 21520003022105 its reverse (50122030002512), we get a palindrome (71642033024617).

The spelling of 21520003022105 in words is "twenty-one trillion, five hundred twenty billion, three million, twenty-two thousand, one hundred five".