21010000000100 has 18 divisors (see below), whose sum is σ = 45591700000434. Its totient is φ = 8404000000000.

The previous prime is 21010000000057. The next prime is 21010000000169. The reversal of 21010000000100 is 100000001012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2371105636 + 21007628894464 = 48694^2 + 4583408^2 .

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 5 ways as a sum of consecutive naturals, for example, 105049999901 + ... + 105050000100.

Almost surely, 2^{21010000000100} is an apocalyptic number.

21010000000100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010000000100 is an abundant number, since it is smaller than the sum of its proper divisors (24581700000334).

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

21010000000100 is a wasteful number, since it uses less digits than its factorization.

21010000000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210100000015 (or 210100000008 counting only the distinct ones).

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

Adding to 21010000000100 its reverse (100000001012), we get a palindrome (21110000001112).

The spelling of 21010000000100 in words is "twenty-one trillion, ten billion, one hundred", and thus it is an aban number.