211121112005 has 12 divisors (see below), whose sum is σ = 262382628612. Its totient is φ = 163072855680.

The previous prime is 211121112001. The next prime is 211121112017. The reversal of 211121112005 is 500211121112.

It can be written as a sum of positive squares in 6 ways, for example, as 1079521 + 211120032484 = 1039^2 + 459478^2 .

It is not a de Polignac number, because 211121112005 - 2² = 211121112001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121112001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25099376 + ... + 25107785.

It is an arithmetic number, because the mean of its divisors is an integer number (21865219051).

Almost surely, 2^211121112005 is an apocalyptic number.

It is an amenable number.

211121112005 is a deficient number, since it is larger than the sum of its proper divisors (51261516607).

211121112005 is an equidigital number, since it uses as much as digits as its factorization.

211121112005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50207224 (or 50207195 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 211121112005 its reverse (500211121112), we get a palindrome (711332233117).

The spelling of 211121112005 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, five".