211211121 has 16 divisors (see below), whose sum is σ = 308323008. Its totient is φ = 127545600.

The previous prime is 211211071. The next prime is 211211123. The reversal of 211211121 is 121112112.

It is not a de Polignac number, because 211211121 - 2²¹ = 209113969 is a prime.

It is a super-2 number, since 2×211211121² = 89220275268153282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211211097 and 211211106.

It is not an unprimeable number, because it can be changed into a prime (211211123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2116 + ... + 20661.

It is an arithmetic number, because the mean of its divisors is an integer number (19270188).

Almost surely, 2^211211121 is an apocalyptic number.

It is an amenable number.

211211121 is a deficient number, since it is larger than the sum of its proper divisors (97111887).

211211121 is a wasteful number, since it uses less digits than its factorization.

211211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23072.

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

The square root of 211211121 is about 14533.1043139448. The cubic root of 211211121 is about 595.5326736537.

Adding to 211211121 its reverse (121112112), we get a palindrome (332323233).

Subtracting from 211211121 its reverse (121112112), we obtain a palindrome (90099009).

The spelling of 211211121 in words is "two hundred eleven million, two hundred eleven thousand, one hundred twenty-one".