211231222331 has 4 divisors (see below), whose sum is σ = 214811412600. Its totient is φ = 207651032064.

The previous prime is 211231222253. The next prime is 211231222361. The reversal of 211231222331 is 133222132112.

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 211231222331 - 2²² = 211227028027 is a prime.

It is a super-2 number, since 2×211231222331² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211231222297 and 211231222306.

It is not an unprimeable number, because it can be changed into a prime (211231222361) 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, 1790095046 + ... + 1790095163.

It is an arithmetic number, because the mean of its divisors is an integer number (53702853150).

Almost surely, 2^211231222331 is an apocalyptic number.

211231222331 is a deficient number, since it is larger than the sum of its proper divisors (3580190269).

211231222331 is an equidigital number, since it uses as much as digits as its factorization.

211231222331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580190268.

The product of its digits is 864, while the sum is 23.

Adding to 211231222331 its reverse (133222132112), we get a palindrome (344453354443).

The spelling of 211231222331 in words is "two hundred eleven billion, two hundred thirty-one million, two hundred twenty-two thousand, three hundred thirty-one".