201211201111 has 4 divisors (see below), whose sum is σ = 206118791424. Its totient is φ = 196303610800.

The previous prime is 201211201097. The next prime is 201211201129. The reversal of 201211201111 is 111102112102.

It is a happy number.

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 201211201111 - 2²¹ = 201209103959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201211201091 and 201211201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211208111) 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, 2453795095 + ... + 2453795176.

It is an arithmetic number, because the mean of its divisors is an integer number (51529697856).

Almost surely, 2^201211201111 is an apocalyptic number.

201211201111 is a deficient number, since it is larger than the sum of its proper divisors (4907590313).

201211201111 is an equidigital number, since it uses as much as digits as its factorization.

201211201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4907590312.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201211201111 its reverse (111102112102), we get a palindrome (312313313213).

The spelling of 201211201111 in words is "two hundred one billion, two hundred eleven million, two hundred one thousand, one hundred eleven".