231220303211 has 4 divisors (see below), whose sum is σ = 231389448912. Its totient is φ = 231051157512.

The previous prime is 231220303133. The next prime is 231220303271. The reversal of 231220303211 is 112303022132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231220303211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231220303271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84570800 + ... + 84573533.

It is an arithmetic number, because the mean of its divisors is an integer number (57847362228).

Almost surely, 2^231220303211 is an apocalyptic number.

231220303211 is a deficient number, since it is larger than the sum of its proper divisors (169145701).

231220303211 is a wasteful number, since it uses less digits than its factorization.

231220303211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169145700.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 231220303211 its reverse (112303022132), we get a palindrome (343523325343).

The spelling of 231220303211 in words is "two hundred thirty-one billion, two hundred twenty million, three hundred three thousand, two hundred eleven".