201011211101221 has 4 divisors (see below), whose sum is σ = 201084546095244. Its totient is φ = 200937876107200.

The previous prime is 201011211101159. The next prime is 201011211101257. The reversal of 201011211101221 is 122101112110102.

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 58575603040900 + 142435608060321 = 7653470^2 + 11934639^2 .

It is a cyclic number.

It is not a de Polignac number, because 201011211101221 - 2⁴³ = 192215118079013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201011211101195 and 201011211101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201011211101821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36667492900 + ... + 36667498381.

It is an arithmetic number, because the mean of its divisors is an integer number (50271136523811).

Almost surely, 2^{201011211101221} is an apocalyptic number.

It is an amenable number.

201011211101221 is a deficient number, since it is larger than the sum of its proper divisors (73334994023).

201011211101221 is an equidigital number, since it uses as much as digits as its factorization.

201011211101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73334994022.

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

Adding to 201011211101221 its reverse (122101112110102), we get a palindrome (323112323211323).

The spelling of 201011211101221 in words is "two hundred one trillion, eleven billion, two hundred eleven million, one hundred one thousand, two hundred twenty-one".