201211100011221 has 4 divisors (see below), whose sum is σ = 268281466681632. Its totient is φ = 134140733340812.

The previous prime is 201211100011171. The next prime is 201211100011309. The reversal of 201211100011221 is 122110001112102.

It is a happy number.

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 201211100011221 - 2¹⁴ = 201211099994837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201211100011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211100011321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33535183335201 + ... + 33535183335206.

It is an arithmetic number, because the mean of its divisors is an integer number (67070366670408).

Almost surely, 2^{201211100011221} is an apocalyptic number.

It is an amenable number.

201211100011221 is a deficient number, since it is larger than the sum of its proper divisors (67070366670411).

201211100011221 is an equidigital number, since it uses as much as digits as its factorization.

201211100011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67070366670410.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201211100011221 its reverse (122110001112102), we get a palindrome (323321101123323).

The spelling of 201211100011221 in words is "two hundred one trillion, two hundred eleven billion, one hundred million, eleven thousand, two hundred twenty-one".