21100010220205 has 16 divisors (see below), whose sum is σ = 30460165130880. Its totient is φ = 13707074308032.

The previous prime is 21100010220197. The next prime is 21100010220227. The reversal of 21100010220205 is 50202201000112.

It is a happy number.

It is not a de Polignac number, because 21100010220205 - 2³ = 21100010220197 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15864668674 + ... + 15864670003.

It is an arithmetic number, because the mean of its divisors is an integer number (1903760320680).

Almost surely, 2^{21100010220205} is an apocalyptic number.

It is an amenable number.

21100010220205 is a deficient number, since it is larger than the sum of its proper divisors (9360154910675).

21100010220205 is a wasteful number, since it uses less digits than its factorization.

21100010220205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31729338708.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21100010220205 its reverse (50202201000112), we get a palindrome (71302211220317).

The spelling of 21100010220205 in words is "twenty-one trillion, one hundred billion, ten million, two hundred twenty thousand, two hundred five".