211210221221201 has 4 divisors (see below), whose sum is σ = 211995389330100. Its totient is φ = 210425053112304.

The previous prime is 211210221221191. The next prime is 211210221221203. The reversal of 211210221221201 is 102122122012112.

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 36794220798976 + 174416000422225 = 6065824^2 + 13206665^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210221221201 - 2³⁸ = 210935343314257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211210221221203) 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, 392584054046 + ... + 392584054583.

It is an arithmetic number, because the mean of its divisors is an integer number (52998847332525).

Almost surely, 2^{211210221221201} is an apocalyptic number.

It is an amenable number.

211210221221201 is a deficient number, since it is larger than the sum of its proper divisors (785168108899).

211210221221201 is an equidigital number, since it uses as much as digits as its factorization.

211210221221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785168108898.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211210221221201 its reverse (102122122012112), we get a palindrome (313332343233313).

The spelling of 211210221221201 in words is "two hundred eleven trillion, two hundred ten billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred one".