21110000210100 has 108 divisors (see below), whose sum is σ = 66218216029420. Its totient is φ = 5625071654400.

The previous prime is 21110000210087. The next prime is 21110000210111. The reversal of 21110000210100 is 101200001112.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3189374517924 + 17920625692176 = 1785882^2 + 4233276^2 .

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

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 7689055 + ... + 10066854.

Almost surely, 2^{21110000210100} is an apocalyptic number.

21110000210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110000210100 is an abundant number, since it is smaller than the sum of its proper divisors (45108215819320).

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

21110000210100 is a wasteful number, since it uses less digits than its factorization.

21110000210100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17757250 (or 17757240 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21110000210100 its reverse (101200001112), we get a palindrome (21211200211212).

The spelling of 21110000210100 in words is "twenty-one trillion, one hundred ten billion, two hundred ten thousand, one hundred".