1211131330231 has 4 divisors (see below), whose sum is σ = 1230985942264. Its totient is φ = 1191276718200.

The previous prime is 1211131330219. The next prime is 1211131330267. The reversal of 1211131330231 is 1320331311121.

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 1211131330231 - 2¹³ = 1211131322039 is a prime.

It is a super-2 number, since 2×1211131330231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211131331231) 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, 9927305925 + ... + 9927306046.

It is an arithmetic number, because the mean of its divisors is an integer number (307746485566).

Almost surely, 2^{1211131330231} is an apocalyptic number.

1211131330231 is a deficient number, since it is larger than the sum of its proper divisors (19854612033).

1211131330231 is an equidigital number, since it uses as much as digits as its factorization.

1211131330231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19854612032.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1211131330231 its reverse (1320331311121), we get a palindrome (2531462641352).

The spelling of 1211131330231 in words is "one trillion, two hundred eleven billion, one hundred thirty-one million, three hundred thirty thousand, two hundred thirty-one".