21010000100 has 36 divisors (see below), whose sum is σ = 45697575168. Its totient is φ = 8384484000.

The previous prime is 21010000093. The next prime is 21010000111. The reversal of 21010000100 is 100001012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200636 + ... + 286835.

It is an arithmetic number, because the mean of its divisors is an integer number (1269377088).

Almost surely, 2^21010000100 is an apocalyptic number.

21010000100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010000100 is an abundant number, since it is smaller than the sum of its proper divisors (24687575068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010000100 is a wasteful number, since it uses less digits than its factorization.

21010000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487916 (or 487909 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 21010000100 its reverse (100001012), we get a palindrome (21110001112).

The spelling of 21010000100 in words is "twenty-one billion, ten million, one hundred", and thus it is an aban number.