21102110002005 has 32 divisors (see below), whose sum is σ = 34777960858368. Its totient is φ = 10919296857600.

The previous prime is 21102110001953. The next prime is 21102110002007. The reversal of 21102110002005 is 50020001120112.

It is not a de Polignac number, because 21102110002005 - 2⁶ = 21102110001941 is a prime.

It is a super-2 number, since 2×21102110002005² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102110002007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94674249 + ... + 94896878.

It is an arithmetic number, because the mean of its divisors is an integer number (1086811276824).

Almost surely, 2^{21102110002005} is an apocalyptic number.

It is an amenable number.

21102110002005 is a deficient number, since it is larger than the sum of its proper divisors (13675850856363).

21102110002005 is a wasteful number, since it uses less digits than its factorization.

21102110002005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189571357.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 21102110002005 its reverse (50020001120112), we get a palindrome (71122111122117).

The spelling of 21102110002005 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, two thousand, five".