2311243221 has 24 divisors (see below), whose sum is σ = 3681680160. Its totient is φ = 1285012512.

The previous prime is 2311243217. The next prime is 2311243229. The reversal of 2311243221 is 1223421132.

It is not a de Polignac number, because 2311243221 - 2² = 2311243217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311243229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207031 + ... + 217908.

It is an arithmetic number, because the mean of its divisors is an integer number (153403340).

Almost surely, 2^2311243221 is an apocalyptic number.

2311243221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2311243221 is a deficient number, since it is larger than the sum of its proper divisors (1370436939).

2311243221 is a wasteful number, since it uses less digits than its factorization.

2311243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424993 (or 424986 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 2311243221 is about 48075.3910124504. The cubic root of 2311243221 is about 1322.1535135513.

Adding to 2311243221 its reverse (1223421132), we get a palindrome (3534664353).

The spelling of 2311243221 in words is "two billion, three hundred eleven million, two hundred forty-three thousand, two hundred twenty-one".