521871635021072 has 80 divisors (see below), whose sum is σ = 1160465105479680. Its totient is φ = 222712487082624.

The previous prime is 521871635021071. The next prime is 521871635021101. The reversal of 521871635021072 is 270120536178125.

It is a self number, because there is not a number n which added to its sum of digits gives 521871635021072.

It is not an unprimeable number, because it can be changed into a prime (521871635021071) 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, 554885843 + ... + 555825549.

It is an arithmetic number, because the mean of its divisors is an integer number (14505813818496).

Almost surely, 2^{521871635021072} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521871635021072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (580232552739840).

521871635021072 is an abundant number, since it is smaller than the sum of its proper divisors (638593470458608).

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

521871635021072 is a wasteful number, since it uses less digits than its factorization.

521871635021072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960708 (or 960702 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 521871635021072 in words is "five hundred twenty-one trillion, eight hundred seventy-one billion, six hundred thirty-five million, twenty-one thousand, seventy-two".