21113000100 has 54 divisors (see below), whose sum is σ = 66177528690. Its totient is φ = 5630133120.

The previous prime is 21113000087. The next prime is 21113000101. The reversal of 21113000100 is 100031112.

It can be written as a sum of positive squares in 3 ways, for example, as 3396325284 + 17716674816 = 58278^2 + 133104^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21113000101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11728545 + ... + 11730344.

Almost surely, 2^21113000100 is an apocalyptic number.

21113000100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113000100 is an abundant number, since it is smaller than the sum of its proper divisors (45064528590).

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

21113000100 is a wasteful number, since it uses less digits than its factorization.

21113000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23458909 (or 23458899 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 21113000100 its reverse (100031112), we get a palindrome (21213031212).

The spelling of 21113000100 in words is "twenty-one billion, one hundred thirteen million, one hundred", and thus it is an aban number.