210210221021 has 16 divisors (see below), whose sum is σ = 220340651520. Its totient is φ = 200162983680.

The previous prime is 210210221003. The next prime is 210210221071. The reversal of 210210221021 is 120122012012.

It is a cyclic number.

It is not a de Polignac number, because 210210221021 - 2³⁰ = 209136479197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210210220987 and 210210221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210221071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20686940 + ... + 20697098.

It is an arithmetic number, because the mean of its divisors is an integer number (13771290720).

Almost surely, 2^210210221021 is an apocalyptic number.

It is an amenable number.

210210221021 is a deficient number, since it is larger than the sum of its proper divisors (10130430499).

210210221021 is a wasteful number, since it uses less digits than its factorization.

210210221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14156.

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

Adding to 210210221021 its reverse (120122012012), we get a palindrome (330332233033).

The spelling of 210210221021 in words is "two hundred ten billion, two hundred ten million, two hundred twenty-one thousand, twenty-one".