31905021341040 has 80 divisors (see below), whose sum is σ = 98953510284288. Its totient is φ = 8503881465088.

The previous prime is 31905021341033. The next prime is 31905021341041. The reversal of 31905021341040 is 4014312050913.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 31905021340992 and 31905021341010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31905021341041) 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, 31724364 + ... + 32714603.

Almost surely, 2^{31905021341040} is an apocalyptic number.

31905021341040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31905021341040 is an abundant number, since it is smaller than the sum of its proper divisors (67048488943248).

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

31905021341040 is a wasteful number, since it uses less digits than its factorization.

31905021341040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64441046 (or 64441040 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

Adding to 31905021341040 its reverse (4014312050913), we get a palindrome (35919333391953).

The spelling of 31905021341040 in words is "thirty-one trillion, nine hundred five billion, twenty-one million, three hundred forty-one thousand, forty".