521140352412 has 48 divisors (see below), whose sum is σ = 1227576091392. Its totient is φ = 172065523200.

The previous prime is 521140352387. The next prime is 521140352417. The reversal of 521140352412 is 214253041125.

It is a self number, because there is not a number n which added to its sum of digits gives 521140352412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521140352417) 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, 214348 + ... + 1043180.

It is an arithmetic number, because the mean of its divisors is an integer number (25574501904).

Almost surely, 2^521140352412 is an apocalyptic number.

It is an amenable number.

521140352412 is an abundant number, since it is smaller than the sum of its proper divisors (706435738980).

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

521140352412 is a wasteful number, since it uses less digits than its factorization.

521140352412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829338 (or 829336 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 521140352412 its reverse (214253041125), we get a palindrome (735393393537).

The spelling of 521140352412 in words is "five hundred twenty-one billion, one hundred forty million, three hundred fifty-two thousand, four hundred twelve".