210201020110021 has 4 divisors (see below), whose sum is σ = 210201746740812. Its totient is φ = 210200293479232.

The previous prime is 210201020110009. The next prime is 210201020110063. The reversal of 210201020110021 is 120011020102012.

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 195680538279396 + 14520481830625 = 13988586^2 + 3810575^2 .

It is a cyclic number.

It is not a de Polignac number, because 210201020110021 - 2⁵ = 210201020109989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210201020109983 and 210201020110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210201020114021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362881300 + ... + 363460093.

It is an arithmetic number, because the mean of its divisors is an integer number (52550436685203).

Almost surely, 2^{210201020110021} is an apocalyptic number.

It is an amenable number.

210201020110021 is a deficient number, since it is larger than the sum of its proper divisors (726630791).

210201020110021 is an equidigital number, since it uses as much as digits as its factorization.

210201020110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726630790.

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

Adding to 210201020110021 its reverse (120011020102012), we get a palindrome (330212040212033).

The spelling of 210201020110021 in words is "two hundred ten trillion, two hundred one billion, twenty million, one hundred ten thousand, twenty-one".