2231311021 has 4 divisors (see below), whose sum is σ = 2242872412. Its totient is φ = 2219749632.

The previous prime is 2231311001. The next prime is 2231311031. The reversal of 2231311021 is 1201131322.

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 265364100 + 1965946921 = 16290^2 + 44339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231311021 - 2⁵ = 2231310989 is a prime.

It is a super-3 number, since 3×2231311021³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2231310986 and 2231311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231311001) 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, 5780406 + ... + 5780791.

It is an arithmetic number, because the mean of its divisors is an integer number (560718103).

Almost surely, 2^2231311021 is an apocalyptic number.

It is an amenable number.

2231311021 is a deficient number, since it is larger than the sum of its proper divisors (11561391).

2231311021 is a wasteful number, since it uses less digits than its factorization.

2231311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11561390.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2231311021 is about 47236.7549795707. The cubic root of 2231311021 is about 1306.7325326529.

Adding to 2231311021 its reverse (1201131322), we get a palindrome (3432442343).

The spelling of 2231311021 in words is "two billion, two hundred thirty-one million, three hundred eleven thousand, twenty-one".