213011121 has 16 divisors (see below), whose sum is σ = 293515200. Its totient is φ = 137323200.

The previous prime is 213011093. The next prime is 213011159. The reversal of 213011121 is 121110312.

It is not a de Polignac number, because 213011121 - 2⁵ = 213011089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213011097 and 213011106.

It is not an unprimeable number, because it can be changed into a prime (213016121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4855 + ... + 21203.

It is an arithmetic number, because the mean of its divisors is an integer number (18344700).

Almost surely, 2^213011121 is an apocalyptic number.

It is an amenable number.

213011121 is a deficient number, since it is larger than the sum of its proper divisors (80504079).

213011121 is a wasteful number, since it uses less digits than its factorization.

213011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16496.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 213011121 is about 14594.9005135355. The cubic root of 213011121 is about 597.2196554860.

Adding to 213011121 its reverse (121110312), we get a palindrome (334121433).

It can be divided in two parts, 21301 and 1121, that added together give a palindrome (22422).

The spelling of 213011121 in words is "two hundred thirteen million, eleven thousand, one hundred twenty-one".