31303420042240 has 88 divisors (see below), whose sum is σ = 77121025532352. Its totient is φ = 12182952591360.

The previous prime is 31303420042199. The next prime is 31303420042243. The reversal of 31303420042240 is 4224002430313.

It is a junction number, because it is equal to n+sod(n) for n = 31303420042199 and 31303420042208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303420042243) 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, 82431496 + ... + 82810375.

Almost surely, 2^{31303420042240} is an apocalyptic number.

It is an amenable number.

31303420042240 is an abundant number, since it is smaller than the sum of its proper divisors (45817605490112).

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

31303420042240 is a wasteful number, since it uses less digits than its factorization.

31303420042240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165241933 (or 165241915 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 31303420042240 its reverse (4224002430313), we get a palindrome (35527422472553).

The spelling of 31303420042240 in words is "thirty-one trillion, three hundred three billion, four hundred twenty million, forty-two thousand, two hundred forty".