210102200110021 has 4 divisors (see below), whose sum is σ = 211635792811692. Its totient is φ = 208568607408352.

The previous prime is 210102200110009. The next prime is 210102200110037. The reversal of 210102200110021 is 120011002201012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54006536979396 + 156095663130625 = 7348914^2 + 12493825^2 .

It is a cyclic number.

It is not a de Polignac number, because 210102200110021 - 2¹¹ = 210102200107973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210102200109983 and 210102200110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210102200110921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766796350630 + ... + 766796350903.

It is an arithmetic number, because the mean of its divisors is an integer number (52908948202923).

Almost surely, 2^{210102200110021} is an apocalyptic number.

It is an amenable number.

210102200110021 is a deficient number, since it is larger than the sum of its proper divisors (1533592701671).

210102200110021 is a wasteful number, since it uses less digits than its factorization.

210102200110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533592701670.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210102200110021 its reverse (120011002201012), we get a palindrome (330113202311033).

The spelling of 210102200110021 in words is "two hundred ten trillion, one hundred two billion, two hundred million, one hundred ten thousand, twenty-one".