520221340 has 12 divisors (see below), whose sum is σ = 1092464856. Its totient is φ = 208088528.

The previous prime is 520221307. The next prime is 520221371. The reversal of 520221340 is 43122025.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13005514 + ... + 13005553.

It is an arithmetic number, because the mean of its divisors is an integer number (91038738).

Almost surely, 2^520221340 is an apocalyptic number.

It is an amenable number.

520221340 is an abundant number, since it is smaller than the sum of its proper divisors (572243516).

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

520221340 is a wasteful number, since it uses less digits than its factorization.

520221340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26011076 (or 26011074 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 520221340 is about 22808.3611861966. The cubic root of 520221340 is about 804.2592313588.

Adding to 520221340 its reverse (43122025), we get a palindrome (563343365).

The spelling of 520221340 in words is "five hundred twenty million, two hundred twenty-one thousand, three hundred forty".