31420103240440 has 64 divisors (see below), whose sum is σ = 71565775257600. Its totient is φ = 12414150016128.

The previous prime is 31420103240429. The next prime is 31420103240443. The reversal of 31420103240440 is 4404230102413.

It is a junction number, because it is equal to n+sod(n) for n = 31420103240399 and 31420103240408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420103240443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12470320 + ... + 14776639.

It is an arithmetic number, because the mean of its divisors is an integer number (1118215238400).

Almost surely, 2^{31420103240440} is an apocalyptic number.

It is an amenable number.

31420103240440 is an abundant number, since it is smaller than the sum of its proper divisors (40145672017160).

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

31420103240440 is a wasteful number, since it uses less digits than its factorization.

31420103240440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27247324 (or 27247320 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 31420103240440 its reverse (4404230102413), we get a palindrome (35824333342853).

The spelling of 31420103240440 in words is "thirty-one trillion, four hundred twenty billion, one hundred three million, two hundred forty thousand, four hundred forty".