311232243021 has 12 divisors (see below), whose sum is σ = 482727560832. Its totient is φ = 177846995928.

The previous prime is 311232243013. The next prime is 311232243067. The reversal of 311232243021 is 120342232113.

It is not a de Polignac number, because 311232243021 - 2³ = 311232243013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311232242982 and 311232243000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311232243001) 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, 1058612925 + ... + 1058613218.

It is an arithmetic number, because the mean of its divisors is an integer number (40227296736).

Almost surely, 2^311232243021 is an apocalyptic number.

It is an amenable number.

311232243021 is a deficient number, since it is larger than the sum of its proper divisors (171495317811).

311232243021 is a wasteful number, since it uses less digits than its factorization.

311232243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117226160 (or 2117226153 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 311232243021 its reverse (120342232113), we get a palindrome (431574475134).

The spelling of 311232243021 in words is "three hundred eleven billion, two hundred thirty-two million, two hundred forty-three thousand, twenty-one".