31121342004340 has 72 divisors (see below), whose sum is σ = 76086854784360. Its totient is φ = 10661491991808.

The previous prime is 31121342004301. The next prime is 31121342004413. The reversal of 31121342004340 is 4340024312113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5751766144656 + 25369575859684 = 2398284^2 + 5036822^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 31121342004299 and 31121342004308.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 11715219 + ... + 14124058.

It is an arithmetic number, because the mean of its divisors is an integer number (1056761872005).

Almost surely, 2^{31121342004340} is an apocalyptic number.

It is an amenable number.

31121342004340 is an abundant number, since it is smaller than the sum of its proper divisors (44965512780020).

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

31121342004340 is a wasteful number, since it uses less digits than its factorization.

31121342004340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25840529 (or 25840520 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 31121342004340 its reverse (4340024312113), we get a palindrome (35461366316453).

The spelling of 31121342004340 in words is "thirty-one trillion, one hundred twenty-one billion, three hundred forty-two million, four thousand, three hundred forty".