521116420 has 48 divisors (see below), whose sum is σ = 1256673600. Its totient is φ = 179521920.

The previous prime is 521116403. The next prime is 521116423. The reversal of 521116420 is 24611125.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 521116391 and 521116400.

It is not an unprimeable number, because it can be changed into a prime (521116423) 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, 58155 + ... + 66514.

It is an arithmetic number, because the mean of its divisors is an integer number (26180700).

Almost surely, 2^521116420 is an apocalyptic number.

It is an amenable number.

521116420 is an abundant number, since it is smaller than the sum of its proper divisors (735557180).

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

521116420 is a wasteful number, since it uses less digits than its factorization.

521116420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124708 (or 124706 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 521116420 is about 22827.9745049796. The cubic root of 521116420 is about 804.7202299277.

Adding to 521116420 its reverse (24611125), we get a palindrome (545727545).

The spelling of 521116420 in words is "five hundred twenty-one million, one hundred sixteen thousand, four hundred twenty".