31224420544540 has 24 divisors (see below), whose sum is σ = 65572367313600. Its totient is φ = 12489561709248.

The previous prime is 31224420544481. The next prime is 31224420544549. The reversal of 31224420544540 is 4544502442213.

It is a junction number, because it is equal to n+sod(n) for n = 31224420544493 and 31224420544502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31224420544549) 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, 11664015 + ... + 14088934.

It is an arithmetic number, because the mean of its divisors is an integer number (2732181971400).

Almost surely, 2^{31224420544540} is an apocalyptic number.

It is an amenable number.

31224420544540 is an abundant number, since it is smaller than the sum of its proper divisors (34347946769060).

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

31224420544540 is a wasteful number, since it uses less digits than its factorization.

31224420544540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25813581 (or 25813579 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 40.

Adding to 31224420544540 its reverse (4544502442213), we get a palindrome (35768922986753).

The spelling of 31224420544540 in words is "thirty-one trillion, two hundred twenty-four billion, four hundred twenty million, five hundred forty-four thousand, five hundred forty".