210210201212221 has 4 divisors (see below), whose sum is σ = 240240229956832. Its totient is φ = 180180172467612.

The previous prime is 210210201212131. The next prime is 210210201212279. The reversal of 210210201212221 is 122212102012012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210210201212221 - 2¹⁹ = 210210200687933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210201212021) 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, 15015014372295 + ... + 15015014372308.

It is an arithmetic number, because the mean of its divisors is an integer number (60060057489208).

Almost surely, 2^{210210201212221} is an apocalyptic number.

It is an amenable number.

210210201212221 is a deficient number, since it is larger than the sum of its proper divisors (30030028744611).

210210201212221 is an equidigital number, since it uses as much as digits as its factorization.

210210201212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30030028744610.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 210210201212221 its reverse (122212102012012), we get a palindrome (332422303224233).

The spelling of 210210201212221 in words is "two hundred ten trillion, two hundred ten billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".