211231100211101 has 4 divisors (see below), whose sum is σ = 211231152774012. Its totient is φ = 211231047648192.

The previous prime is 211231100210959. The next prime is 211231100211149. The reversal of 211231100211101 is 101112001132112.

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 69758392918201 + 141472707292900 = 8352149^2 + 11894230^2 .

It is a cyclic number.

It is not a de Polignac number, because 211231100211101 - 2³⁰ = 211230026469277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211231100211101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211231100211601) 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, 19704950 + ... + 28473623.

It is an arithmetic number, because the mean of its divisors is an integer number (52807788193503).

Almost surely, 2^{211231100211101} is an apocalyptic number.

It is an amenable number.

211231100211101 is a deficient number, since it is larger than the sum of its proper divisors (52562911).

211231100211101 is an equidigital number, since it uses as much as digits as its factorization.

211231100211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52562910.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 211231100211101 its reverse (101112001132112), we get a palindrome (312343101343213).

The spelling of 211231100211101 in words is "two hundred eleven trillion, two hundred thirty-one billion, one hundred million, two hundred eleven thousand, one hundred one".