31311132033220 has 24 divisors (see below), whose sum is σ = 70811329368024. Its totient is φ = 11561033366016.

The previous prime is 31311132033217. The next prime is 31311132033221. The reversal of 31311132033220 is 2233023111313.

It can be written as a sum of positive squares in 4 ways, for example, as 2123391038596 + 29187740994624 = 1457186^2 + 5402568^2 .

It is a super-2 number, since 2×31311132033220² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31311132033221) 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 7 ways as a sum of consecutive naturals, for example, 60213715189 + ... + 60213715708.

It is an arithmetic number, because the mean of its divisors is an integer number (2950472057001).

Almost surely, 2^{31311132033220} is an apocalyptic number.

It is an amenable number.

31311132033220 is an abundant number, since it is smaller than the sum of its proper divisors (39500197334804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31311132033220 is a wasteful number, since it uses less digits than its factorization.

31311132033220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120427430919 (or 120427430917 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31311132033220 its reverse (2233023111313), we get a palindrome (33544155144533).

The spelling of 31311132033220 in words is "thirty-one trillion, three hundred eleven billion, one hundred thirty-two million, thirty-three thousand, two hundred twenty".