521071420 has 96 divisors (see below), whose sum is σ = 1227441600. Its totient is φ = 184848384.

The previous prime is 521071387. The next prime is 521071429. The reversal of 521071420 is 24170125.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 521071391 and 521071400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521071429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 423366 + ... + 424594.

It is an arithmetic number, because the mean of its divisors is an integer number (12785850).

Almost surely, 2^521071420 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 521071420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (613720800).

521071420 is an abundant number, since it is smaller than the sum of its proper divisors (706370180).

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

521071420 is a wasteful number, since it uses less digits than its factorization.

521071420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 521071420 is about 22826.9888509194. The cubic root of 521071420 is about 804.6970659082.

The spelling of 521071420 in words is "five hundred twenty-one million, seventy-one thousand, four hundred twenty".