210021033121 has 16 divisors (see below), whose sum is σ = 214460254800. Its totient is φ = 205630368768.

The previous prime is 210021033113. The next prime is 210021033137. The reversal of 210021033121 is 121330120012.

It can be written as a sum of positive squares in 8 ways, for example, as 40080040000 + 169940993121 = 200200^2 + 412239^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021033121 - 2³ = 210021033113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021033095 and 210021033104.

It is not an unprimeable number, because it can be changed into a prime (210021033161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18552355 + ... + 18563671.

It is an arithmetic number, because the mean of its divisors is an integer number (13403765925).

Almost surely, 2^210021033121 is an apocalyptic number.

It is an amenable number.

210021033121 is a deficient number, since it is larger than the sum of its proper divisors (4439221679).

210021033121 is a wasteful number, since it uses less digits than its factorization.

210021033121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13428.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 210021033121 its reverse (121330120012), we get a palindrome (331351153133).

The spelling of 210021033121 in words is "two hundred ten billion, twenty-one million, thirty-three thousand, one hundred twenty-one".