521031135120140 has 24 divisors (see below), whose sum is σ = 1094167010804112. Its totient is φ = 208412144133440.

The previous prime is 521031135120113. The next prime is 521031135120149. The reversal of 521031135120140 is 41021531130125.

It is a happy number.

It is a super-2 number, since 2×521031135120140² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521031135120149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5335754 + ... + 32718993.

It is an arithmetic number, because the mean of its divisors is an integer number (45590292116838).

Almost surely, 2^{521031135120140} is an apocalyptic number.

It is an amenable number.

521031135120140 is an abundant number, since it is smaller than the sum of its proper divisors (573135875683972).

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

521031135120140 is a wasteful number, since it uses less digits than its factorization.

521031135120140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38739337 (or 38739335 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 521031135120140 its reverse (41021531130125), we get a palindrome (562052666250265).

The spelling of 521031135120140 in words is "five hundred twenty-one trillion, thirty-one billion, one hundred thirty-five million, one hundred twenty thousand, one hundred forty".