2311030220221 has 4 divisors (see below), whose sum is σ = 2390720917500. Its totient is φ = 2231339522944.

The previous prime is 2311030220141. The next prime is 2311030220269. The reversal of 2311030220221 is 1220220301132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1456535196900 + 854495023321 = 1206870^2 + 924389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311030220221 - 2¹¹ = 2311030218173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311030520221) 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, 39845348596 + ... + 39845348653.

It is an arithmetic number, because the mean of its divisors is an integer number (597680229375).

Almost surely, 2^{2311030220221} is an apocalyptic number.

It is an amenable number.

2311030220221 is a deficient number, since it is larger than the sum of its proper divisors (79690697279).

2311030220221 is an equidigital number, since it uses as much as digits as its factorization.

2311030220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79690697278.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 2311030220221 its reverse (1220220301132), we get a palindrome (3531250521353).

The spelling of 2311030220221 in words is "two trillion, three hundred eleven billion, thirty million, two hundred twenty thousand, two hundred twenty-one".