2231221131 has 12 divisors (see below), whose sum is σ = 3228668352. Its totient is φ = 1484806896.

The previous prime is 2231221081. The next prime is 2231221141. The reversal of 2231221131 is 1311221322.

It is not a de Polignac number, because 2231221131 - 2¹⁸ = 2230958987 is a prime.

It is a super-3 number, since 3×2231221131³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2231221141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217531 + ... + 227556.

It is an arithmetic number, because the mean of its divisors is an integer number (269055696).

Almost surely, 2^2231221131 is an apocalyptic number.

2231221131 is a deficient number, since it is larger than the sum of its proper divisors (997447221).

2231221131 is a wasteful number, since it uses less digits than its factorization.

2231221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445650 (or 445647 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2231221131 is about 47235.8034863386. The cubic root of 2231221131 is about 1306.7149848580.

Adding to 2231221131 its reverse (1311221322), we get a palindrome (3542442453).

The spelling of 2231221131 in words is "two billion, two hundred thirty-one million, two hundred twenty-one thousand, one hundred thirty-one".