210021000120013 has 4 divisors (see below), whose sum is σ = 210021937197660. Its totient is φ = 210020063042368.

The previous prime is 210021000119951. The next prime is 210021000120017. The reversal of 210021000120013 is 310021000120012.

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 49335410022889 + 160685590097124 = 7023917^2 + 12676182^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021000120013 - 2¹⁷ = 210020999988941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021000119975 and 210021000120002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021000120017) 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, 468202558 + ... + 468650911.

It is an arithmetic number, because the mean of its divisors is an integer number (52505484299415).

Almost surely, 2^{210021000120013} is an apocalyptic number.

It is an amenable number.

210021000120013 is a deficient number, since it is larger than the sum of its proper divisors (937077647).

210021000120013 is an equidigital number, since it uses as much as digits as its factorization.

210021000120013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937077646.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 210021000120013 its reverse (310021000120012), we get a palindrome (520042000240025).

Subtracting 210021000120013 from its reverse (310021000120012), we obtain a palindrome (99999999999999).

The spelling of 210021000120013 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty thousand, thirteen".