2231121311 has 4 divisors (see below), whose sum is σ = 2231215800. Its totient is φ = 2231026824.

The previous prime is 2231121283. The next prime is 2231121317. The reversal of 2231121311 is 1131211322.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2231121311 - 2²⁶ = 2164012447 is a prime.

It is a super-3 number, since 3×2231121311³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2231121311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231121317) 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, 22220 + ... + 70398.

It is an arithmetic number, because the mean of its divisors is an integer number (557803950).

Almost surely, 2^2231121311 is an apocalyptic number.

2231121311 is a deficient number, since it is larger than the sum of its proper divisors (94489).

2231121311 is an equidigital number, since it uses as much as digits as its factorization.

2231121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94488.

The product of its digits is 72, while the sum is 17.

The square root of 2231121311 is about 47234.7468607592. The cubic root of 2231121311 is about 1306.6954980348.

Adding to 2231121311 its reverse (1131211322), we get a palindrome (3362332633).

The spelling of 2231121311 in words is "two billion, two hundred thirty-one million, one hundred twenty-one thousand, three hundred eleven".