213132310121 has 4 divisors (see below), whose sum is σ = 225669504852. Its totient is φ = 200595115392.

The previous prime is 213132310109. The next prime is 213132310123. The reversal of 213132310121 is 121013231312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139734663721 + 73397646400 = 373811^2 + 270920^2 .

It is a cyclic number.

It is not a de Polignac number, because 213132310121 - 2¹⁰ = 213132309097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213132310093 and 213132310102.

It is not an unprimeable number, because it can be changed into a prime (213132310123) 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 3 ways as a sum of consecutive naturals, for example, 6268597340 + ... + 6268597373.

It is an arithmetic number, because the mean of its divisors is an integer number (56417376213).

Almost surely, 2^213132310121 is an apocalyptic number.

It is an amenable number.

213132310121 is a deficient number, since it is larger than the sum of its proper divisors (12537194731).

213132310121 is a wasteful number, since it uses less digits than its factorization.

213132310121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12537194730.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 213132310121 its reverse (121013231312), we get a palindrome (334145541433).

The spelling of 213132310121 in words is "two hundred thirteen billion, one hundred thirty-two million, three hundred ten thousand, one hundred twenty-one".