211120121 has 4 divisors (see below), whose sum is σ = 212067072. Its totient is φ = 210173172.

The previous prime is 211120109. The next prime is 211120139. The reversal of 211120121 is 121021112.

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 a cyclic number.

It is not a de Polignac number, because 211120121 - 2⁶ = 211120057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211120181) 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, 473141 + ... + 473586.

It is an arithmetic number, because the mean of its divisors is an integer number (53016768).

Almost surely, 2^211120121 is an apocalyptic number.

It is an amenable number.

211120121 is a deficient number, since it is larger than the sum of its proper divisors (946951).

211120121 is an equidigital number, since it uses as much as digits as its factorization.

211120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946950.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 211120121 is about 14529.9731933683. The cubic root of 211120121 is about 595.4471332428.

Adding to 211120121 its reverse (121021112), we get a palindrome (332141233).

Subtracting from 211120121 its reverse (121021112), we obtain a palindrome (90099009).

The spelling of 211120121 in words is "two hundred eleven million, one hundred twenty thousand, one hundred twenty-one".