211122121 has 24 divisors (see below), whose sum is σ = 253932032. Its totient is φ = 171763200.

The previous prime is 211122101. The next prime is 211122137. The reversal of 211122121 is 121221112.

It is not a de Polignac number, because 211122121 - 2⁹ = 211121609 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 (211122101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1093801 + ... + 1093993.

Almost surely, 2^211122121 is an apocalyptic number.

It is an amenable number.

211122121 is a deficient number, since it is larger than the sum of its proper divisors (42809911).

211122121 is an equidigital number, since it uses as much as digits as its factorization.

211122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 302 counting only the distinct ones).

The product of its digits is 16, while the sum is 13.

The square root of 211122121 is about 14530.0420164568. The cubic root of 211122121 is about 595.4490135160.

Adding to 211122121 its reverse (121221112), we get a palindrome (332343233).

The spelling of 211122121 in words is "two hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".