211223303231 has 4 divisors (see below), whose sum is σ = 211237606272. Its totient is φ = 211209000192.

The previous prime is 211223303227. The next prime is 211223303237. The reversal of 211223303231 is 132303322112.

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

It is a cyclic number.

It is not a de Polignac number, because 211223303231 - 2² = 211223303227 is a prime.

It is a super-2 number, since 2×211223303231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211223303197 and 211223303206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211223303237) 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, 7129346 + ... + 7158911.

It is an arithmetic number, because the mean of its divisors is an integer number (52809401568).

Almost surely, 2^211223303231 is an apocalyptic number.

211223303231 is a deficient number, since it is larger than the sum of its proper divisors (14303041).

211223303231 is a wasteful number, since it uses less digits than its factorization.

211223303231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14303040.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 211223303231 its reverse (132303322112), we get a palindrome (343526625343).

The spelling of 211223303231 in words is "two hundred eleven billion, two hundred twenty-three million, three hundred three thousand, two hundred thirty-one".