211121121 has 4 divisors (see below), whose sum is σ = 281494832. Its totient is φ = 140747412.

The previous prime is 211121107. The next prime is 211121161. The reversal of 211121121 is 121121112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 211121121 - 2⁵ = 211121089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121097 and 211121106.

It is not an unprimeable number, because it can be changed into a prime (211121161) 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, 35186851 + ... + 35186856.

It is an arithmetic number, because the mean of its divisors is an integer number (70373708).

Almost surely, 2^211121121 is an apocalyptic number.

It is an amenable number.

211121121 is a deficient number, since it is larger than the sum of its proper divisors (70373711).

211121121 is an equidigital number, since it uses as much as digits as its factorization.

211121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70373710.

The product of its digits is 8, while the sum is 12.

The square root of 211121121 is about 14530.0076049533. The cubic root of 211121121 is about 595.4480733809.

Adding to 211121121 its reverse (121121112), we get a palindrome (332242233).

Subtracting from 211121121 its reverse (121121112), we obtain a palindrome (90000009).

It can be divided in two parts, 2111 and 21121, that added together give a palindrome (23232).

The spelling of 211121121 in words is "two hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".