521020021235412 has 96 divisors (see below), whose sum is σ = 1242381751857792. Its totient is φ = 169883355672576.

The previous prime is 521020021235381. The next prime is 521020021235453. The reversal of 521020021235412 is 214532120020125.

It is a self number, because there is not a number n which added to its sum of digits gives 521020021235412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6958679608 + ... + 6958754480.

It is an arithmetic number, because the mean of its divisors is an integer number (12941476581852).

Almost surely, 2^{521020021235412} is an apocalyptic number.

It is an amenable number.

521020021235412 is an abundant number, since it is smaller than the sum of its proper divisors (721361730622380).

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

521020021235412 is a wasteful number, since it uses less digits than its factorization.

521020021235412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107737 (or 107735 counting only the distinct ones).

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

Adding to 521020021235412 its reverse (214532120020125), we get a palindrome (735552141255537).

The spelling of 521020021235412 in words is "five hundred twenty-one trillion, twenty billion, twenty-one million, two hundred thirty-five thousand, four hundred twelve".