521271020 has 24 divisors (see below), whose sum is σ = 1095841824. Its totient is φ = 208285056.

The previous prime is 521271013. The next prime is 521271041. The reversal of 521271020 is 20172125.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 521270983 and 521271001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5864 + ... + 32816.

It is an arithmetic number, because the mean of its divisors is an integer number (45660076).

Almost surely, 2^521271020 is an apocalyptic number.

It is an amenable number.

521271020 is an abundant number, since it is smaller than the sum of its proper divisors (574570804).

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

521271020 is a wasteful number, since it uses less digits than its factorization.

521271020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27929 (or 27927 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 521271020 is about 22831.3604500476. The cubic root of 521271020 is about 804.7998010446.

The spelling of 521271020 in words is "five hundred twenty-one million, two hundred seventy-one thousand, twenty".