21100210005 has 64 divisors (see below), whose sum is σ = 40466055168. Its totient is φ = 9179385600.

The previous prime is 21100209997. The next prime is 21100210007. The reversal of 21100210005 is 50001200112.

It is not a de Polignac number, because 21100210005 - 2³ = 21100209997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100210007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 453580 + ... + 497930.

It is an arithmetic number, because the mean of its divisors is an integer number (632282112).

Almost surely, 2^21100210005 is an apocalyptic number.

It is an amenable number.

21100210005 is a deficient number, since it is larger than the sum of its proper divisors (19365845163).

21100210005 is a wasteful number, since it uses less digits than its factorization.

21100210005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44586.

The product of its (nonzero) digits is 20, while the sum is 12.

Adding to 21100210005 its reverse (50001200112), we get a palindrome (71101410117).

The spelling of 21100210005 in words is "twenty-one billion, one hundred million, two hundred ten thousand, five".