31240021004440 has 32 divisors (see below), whose sum is σ = 71079823080000. Its totient is φ = 12355603811584.

The previous prime is 31240021004417. The next prime is 31240021004441. The reversal of 31240021004440 is 4440012004213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240021004441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4387639840 + ... + 4387646959.

It is an arithmetic number, because the mean of its divisors is an integer number (2221244471250).

Almost surely, 2^{31240021004440} is an apocalyptic number.

It is an amenable number.

31240021004440 is an abundant number, since it is smaller than the sum of its proper divisors (39839802075560).

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

31240021004440 is a wasteful number, since it uses less digits than its factorization.

31240021004440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8775286899 (or 8775286895 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 31240021004440 its reverse (4440012004213), we get a palindrome (35680033008653).

The spelling of 31240021004440 in words is "thirty-one trillion, two hundred forty billion, twenty-one million, four thousand, four hundred forty".