231220203222213 has 6 divisors (see below), whose sum is σ = 333984737987654. Its totient is φ = 154146802148136.

The previous prime is 231220203222193. The next prime is 231220203222221. The reversal of 231220203222213 is 312222302022132.

231220203222213 is a `hidden beast` number, since 2 + 3 + 1 + 2 + 20 + 203 + 222 + 213 = 666.

It can be written as a sum of positive squares in only one way, i.e., 227674239298884 + 3545963923329 = 15088878^2 + 1883073^2 .

It is not a de Polignac number, because 231220203222213 - 2¹² = 231220203218117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220203222013) 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 5 ways as a sum of consecutive naturals, for example, 12845566845670 + ... + 12845566845687.

Almost surely, 2^{231220203222213} is an apocalyptic number.

It is an amenable number.

231220203222213 is a deficient number, since it is larger than the sum of its proper divisors (102764534765441).

231220203222213 is a wasteful number, since it uses less digits than its factorization.

231220203222213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25691133691363 (or 25691133691360 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 231220203222213 its reverse (312222302022132), we get a palindrome (543442505244345).

The spelling of 231220203222213 in words is "two hundred thirty-one trillion, two hundred twenty billion, two hundred three million, two hundred twenty-two thousand, two hundred thirteen".