210002112020021 has 4 divisors (see below), whose sum is σ = 211534974151692. Its totient is φ = 208469249888352.

The previous prime is 210002112019927. The next prime is 210002112020083. The reversal of 210002112020021 is 120020211200012.

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 64958989761796 + 145043122258225 = 8059714^2 + 12043385^2 .

It is a cyclic number.

It is not a de Polignac number, because 210002112020021 - 2¹⁰ = 210002112018997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210002112019978 and 210002112020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210002112020321) 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, 766431065630 + ... + 766431065903.

It is an arithmetic number, because the mean of its divisors is an integer number (52883743537923).

Almost surely, 2^{210002112020021} is an apocalyptic number.

It is an amenable number.

210002112020021 is a deficient number, since it is larger than the sum of its proper divisors (1532862131671).

210002112020021 is a wasteful number, since it uses less digits than its factorization.

210002112020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532862131670.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210002112020021 its reverse (120020211200012), we get a palindrome (330022323220033).

The spelling of 210002112020021 in words is "two hundred ten trillion, two billion, one hundred twelve million, twenty thousand, twenty-one".