210210010101221 has 16 divisors (see below), whose sum is σ = 228910818780336. Its totient is φ = 191878676914176.

The previous prime is 210210010101191. The next prime is 210210010101307. The reversal of 210210010101221 is 122101010012012.

It can be written as a sum of positive squares in 8 ways, for example, as 150168603748900 + 60041406352321 = 12254330^2 + 7748639^2 .

It is a cyclic number.

It is not a de Polignac number, because 210210010101221 - 2³⁴ = 210192830232037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210210010101196 and 210210010101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210010107221) 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, 164603360 + ... + 165875513.

It is an arithmetic number, because the mean of its divisors is an integer number (14306926173771).

Almost surely, 2^{210210010101221} is an apocalyptic number.

It is an amenable number.

210210010101221 is a deficient number, since it is larger than the sum of its proper divisors (18700808679115).

210210010101221 is a wasteful number, since it uses less digits than its factorization.

210210010101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330479432.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210210010101221 its reverse (122101010012012), we get a palindrome (332311020113233).

The spelling of 210210010101221 in words is "two hundred ten trillion, two hundred ten billion, ten million, one hundred one thousand, two hundred twenty-one".