211211221101101 has 4 divisors (see below), whose sum is σ = 227458238108892. Its totient is φ = 194964204093312.

The previous prime is 211211221101047. The next prime is 211211221101121. The reversal of 211211221101101 is 101101122112112.

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 104504924245225 + 106706296855876 = 10222765^2 + 10329874^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211221101101 - 2⁴⁶ = 140842476923437 is a prime.

It is a super-2 number, since 2×211211221101101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211211221101101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211221101121) 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, 8123508503876 + ... + 8123508503901.

It is an arithmetic number, because the mean of its divisors is an integer number (56864559527223).

Almost surely, 2^{211211221101101} is an apocalyptic number.

It is an amenable number.

211211221101101 is a deficient number, since it is larger than the sum of its proper divisors (16247017007791).

211211221101101 is a wasteful number, since it uses less digits than its factorization.

211211221101101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16247017007790.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211211221101101 its reverse (101101122112112), we get a palindrome (312312343213213).

The spelling of 211211221101101 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-one million, one hundred one thousand, one hundred one".