210100021101 has 20 divisors (see below), whose sum is σ = 318998258524. Its totient is φ = 137770502400.

The previous prime is 210100021091. The next prime is 210100021133. The reversal of 210100021101 is 101120001012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 100853245476 + 109246775625 = 317574^2 + 330525^2 .

It is not a de Polignac number, because 210100021101 - 2⁵ = 210100021069 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210100021151) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21255940 + ... + 21265821.

Almost surely, 2^210100021101 is an apocalyptic number.

It is an amenable number.

210100021101 is a deficient number, since it is larger than the sum of its proper divisors (108898237423).

210100021101 is an equidigital number, since it uses as much as digits as its factorization.

210100021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42521834 (or 42521825 counting only the distinct ones).

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

Adding to 210100021101 its reverse (101120001012), we get a palindrome (311220022113).

The spelling of 210100021101 in words is "two hundred ten billion, one hundred million, twenty-one thousand, one hundred one".