2231120232221 has 4 divisors (see below), whose sum is σ = 2231874756732. Its totient is φ = 2230365707712.

The previous prime is 2231120232197. The next prime is 2231120232223. The reversal of 2231120232221 is 1222320211322.

It is a happy number.

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 1515385620100 + 715734612121 = 1231010^2 + 846011^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231120232221 - 2¹⁴ = 2231120215837 is a prime.

It is a super-3 number, since 3×2231120232221³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231120232223) 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, 377257820 + ... + 377263733.

It is an arithmetic number, because the mean of its divisors is an integer number (557968689183).

Almost surely, 2^{2231120232221} is an apocalyptic number.

It is an amenable number.

2231120232221 is a deficient number, since it is larger than the sum of its proper divisors (754524511).

2231120232221 is an equidigital number, since it uses as much as digits as its factorization.

2231120232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754524510.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2231120232221 its reverse (1222320211322), we get a palindrome (3453440443543).

The spelling of 2231120232221 in words is "two trillion, two hundred thirty-one billion, one hundred twenty million, two hundred thirty-two thousand, two hundred twenty-one".