211442121 has 12 divisors (see below), whose sum is σ = 333181680. Its totient is φ = 128146680.

The previous prime is 211442113. The next prime is 211442131. The reversal of 211442121 is 121244112.

211442121 is a `hidden beast` number, since 211 + 442 + 12 + 1 = 666.

211442121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211442121 - 2³ = 211442113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211442094 and 211442103.

It is not an unprimeable number, because it can be changed into a prime (211442111) 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, 1067791 + ... + 1067988.

It is an arithmetic number, because the mean of its divisors is an integer number (27765140).

Almost surely, 2^211442121 is an apocalyptic number.

It is an amenable number.

211442121 is a deficient number, since it is larger than the sum of its proper divisors (121739559).

211442121 is a wasteful number, since it uses less digits than its factorization.

211442121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135796 (or 2135793 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 211442121 is about 14541.0495150797. The cubic root of 211442121 is about 595.7497044064.

Adding to 211442121 its reverse (121244112), we get a palindrome (332686233).

The spelling of 211442121 in words is "two hundred eleven million, four hundred forty-two thousand, one hundred twenty-one".