210010200021 has 12 divisors (see below), whose sum is σ = 303616768780. Its totient is φ = 139882783680.

The previous prime is 210010200019. The next prime is 210010200079. The reversal of 210010200021 is 120002010012.

It can be written as a sum of positive squares in 2 ways, for example, as 130888386225 + 79121813796 = 361785^2 + 281286^2 .

It is not a de Polignac number, because 210010200021 - 2¹ = 210010200019 is a prime.

It is a super-2 number, since 2×210010200021² (a number of 23 digits) contains 22 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210010199976 and 210010200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210010200821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10323970 + ... + 10344291.

Almost surely, 2^210010200021 is an apocalyptic number.

It is an amenable number.

210010200021 is a deficient number, since it is larger than the sum of its proper divisors (93606568759).

210010200021 is a wasteful number, since it uses less digits than its factorization.

210010200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20669396 (or 20669393 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210010200021 its reverse (120002010012), we get a palindrome (330012210033).

The spelling of 210010200021 in words is "two hundred ten billion, ten million, two hundred thousand, twenty-one".