201211211001111 has 4 divisors (see below), whose sum is σ = 268281614668152. Its totient is φ = 134140807334072.

The previous prime is 201211211001089. The next prime is 201211211001149. The reversal of 201211211001111 is 111100112112102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201211211001111 - 2⁷ = 201211211000983 is a prime.

It is a super-2 number, since 2×201211211001111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211211001191) 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, 33535201833516 + ... + 33535201833521.

It is an arithmetic number, because the mean of its divisors is an integer number (67070403667038).

Almost surely, 2^{201211211001111} is an apocalyptic number.

201211211001111 is a deficient number, since it is larger than the sum of its proper divisors (67070403667041).

201211211001111 is an equidigital number, since it uses as much as digits as its factorization.

201211211001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67070403667040.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 201211211001111 its reverse (111100112112102), we get a palindrome (312311323113213).

The spelling of 201211211001111 in words is "two hundred one trillion, two hundred eleven billion, two hundred eleven million, one thousand, one hundred eleven".