2231320021 has 8 divisors (see below), whose sum is σ = 2550999744. Its totient is φ = 1911870240.

The previous prime is 2231320019. The next prime is 2231320033. The reversal of 2231320021 is 1200231322.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2231320021 - 2¹ = 2231320019 is a prime.

It is a super-3 number, since 3×2231320021³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2231319977 and 2231320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231320061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36160 + ... + 75961.

It is an arithmetic number, because the mean of its divisors is an integer number (318874968).

Almost surely, 2^2231320021 is an apocalyptic number.

It is an amenable number.

2231320021 is a deficient number, since it is larger than the sum of its proper divisors (319679723).

2231320021 is a wasteful number, since it uses less digits than its factorization.

2231320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114971.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2231320021 is about 47236.8502442743. The cubic root of 2231320021 is about 1306.7342895538.

Adding to 2231320021 its reverse (1200231322), we get a palindrome (3431551343).

The spelling of 2231320021 in words is "two billion, two hundred thirty-one million, three hundred twenty thousand, twenty-one".