213111132121 has 8 divisors (see below), whose sum is σ = 220106513160. Its totient is φ = 206225914752.

The previous prime is 213111132107. The next prime is 213111132161. The reversal of 213111132121 is 121231111312.

It can be written as a sum of positive squares in 4 ways, for example, as 16112748096 + 196998384025 = 126936^2 + 443845^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213111132121 - 2⁹ = 213111131609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213111132161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27536986 + ... + 27544723.

It is an arithmetic number, because the mean of its divisors is an integer number (27513314145).

Almost surely, 2^213111132121 is an apocalyptic number.

It is an amenable number.

213111132121 is a deficient number, since it is larger than the sum of its proper divisors (6995381039).

213111132121 is an equidigital number, since it uses as much as digits as its factorization.

213111132121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55081835.

The product of its digits is 72, while the sum is 19.

Adding to 213111132121 its reverse (121231111312), we get a palindrome (334342243433).

The spelling of 213111132121 in words is "two hundred thirteen billion, one hundred eleven million, one hundred thirty-two thousand, one hundred twenty-one".