231211200321 has 12 divisors (see below), whose sum is σ = 336927237348. Its totient is φ = 152776721664.

The previous prime is 231211200301. The next prime is 231211200343. The reversal of 231211200321 is 123002112132.

231211200321 is a `hidden beast` number, since 2 + 312 + 11 + 20 + 0 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 112161359025 + 119049841296 = 334905^2 + 345036^2 .

It is not a de Polignac number, because 231211200321 - 2⁵ = 231211200289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231211200294 and 231211200303.

It is not an unprimeable number, because it can be changed into a prime (231211200301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113672140 + ... + 113674173.

It is an arithmetic number, because the mean of its divisors is an integer number (28077269779).

Almost surely, 2^231211200321 is an apocalyptic number.

It is an amenable number.

231211200321 is a deficient number, since it is larger than the sum of its proper divisors (105716037027).

231211200321 is a wasteful number, since it uses less digits than its factorization.

231211200321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227346432 (or 227346429 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 231211200321 its reverse (123002112132), we get a palindrome (354213312453).

The spelling of 231211200321 in words is "two hundred thirty-one billion, two hundred eleven million, two hundred thousand, three hundred twenty-one".