31520420534042 has 64 divisors (see below), whose sum is σ = 53584403558400. Its totient is φ = 13774621452480.

The previous prime is 31520420534041. The next prime is 31520420534063. The reversal of 31520420534042 is 24043502402513.

It is a happy number.

It is a super-3 number, since 3×31520420534042³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31520420533993 and 31520420534011.

It is not an unprimeable number, because it can be changed into a prime (31520420534041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 383703809 + ... + 383785947.

It is an arithmetic number, because the mean of its divisors is an integer number (837256305600).

Almost surely, 2^{31520420534042} is an apocalyptic number.

31520420534042 is a deficient number, since it is larger than the sum of its proper divisors (22063983024358).

31520420534042 is a wasteful number, since it uses less digits than its factorization.

31520420534042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84731.

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 31520420534042 its reverse (24043502402513), we get a palindrome (55563922936555).

The spelling of 31520420534042 in words is "thirty-one trillion, five hundred twenty billion, four hundred twenty million, five hundred thirty-four thousand, forty-two".