521411420 has 96 divisors (see below), whose sum is σ = 1204180992. Its totient is φ = 188863488.

The previous prime is 521411417. The next prime is 521411459. The reversal of 521411420 is 24114125.

It is a happy number.

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 = 521411392 and 521411401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1070417 + ... + 1070903.

It is an arithmetic number, because the mean of its divisors is an integer number (12543552).

Almost surely, 2^521411420 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 521411420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602090496).

521411420 is an abundant number, since it is smaller than the sum of its proper divisors (682769572).

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

521411420 is a wasteful number, since it uses less digits than its factorization.

521411420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 521411420 is about 22834.4349612597. The cubic root of 521411420 is about 804.8720499289.

Adding to 521411420 its reverse (24114125), we get a palindrome (545525545).

The spelling of 521411420 in words is "five hundred twenty-one million, four hundred eleven thousand, four hundred twenty".