2311220021 has 16 divisors (see below), whose sum is σ = 2769431040. Its totient is φ = 1903975920.

The previous prime is 2311220017. The next prime is 2311220069. The reversal of 2311220021 is 1200221132.

It is a happy number.

It is not a de Polignac number, because 2311220021 - 2² = 2311220017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2311219978 and 2311220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311220071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235595 + ... + 245208.

It is an arithmetic number, because the mean of its divisors is an integer number (173089440).

Almost surely, 2^2311220021 is an apocalyptic number.

It is an amenable number.

2311220021 is a deficient number, since it is larger than the sum of its proper divisors (458211019).

2311220021 is a wasteful number, since it uses less digits than its factorization.

2311220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480856.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2311220021 is about 48075.1497241558. The cubic root of 2311220021 is about 1322.1490896603.

Adding to 2311220021 its reverse (1200221132), we get a palindrome (3511441153).

The spelling of 2311220021 in words is "two billion, three hundred eleven million, two hundred twenty thousand, twenty-one".