213121302231 has 16 divisors (see below), whose sum is σ = 285440423040. Its totient is φ = 141442349280.

The previous prime is 213121302221. The next prime is 213121302257. The reversal of 213121302231 is 132203121312.

It is not a de Polignac number, because 213121302231 - 2¹⁹ = 213120777943 is a prime.

It is a super-2 number, since 2×213121302231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213121302198 and 213121302207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121302221) 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 15 ways as a sum of consecutive naturals, for example, 939556 + ... + 1144118.

It is an arithmetic number, because the mean of its divisors is an integer number (17840026440).

Almost surely, 2^213121302231 is an apocalyptic number.

213121302231 is a deficient number, since it is larger than the sum of its proper divisors (72319120809).

213121302231 is a wasteful number, since it uses less digits than its factorization.

213121302231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206126.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 213121302231 its reverse (132203121312), we get a palindrome (345324423543).

The spelling of 213121302231 in words is "two hundred thirteen billion, one hundred twenty-one million, three hundred two thousand, two hundred thirty-one".