520030405421 has 4 divisors (see below), whose sum is σ = 542640423072. Its totient is φ = 497420387772.

The previous prime is 520030405369. The next prime is 520030405493. The reversal of 520030405421 is 124504030025.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520030405421 - 2¹⁴ = 520030389037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520030405021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11305008791 + ... + 11305008836.

It is an arithmetic number, because the mean of its divisors is an integer number (135660105768).

Almost surely, 2^520030405421 is an apocalyptic number.

It is an amenable number.

520030405421 is a deficient number, since it is larger than the sum of its proper divisors (22610017651).

520030405421 is a wasteful number, since it uses less digits than its factorization.

520030405421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22610017650.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 520030405421 its reverse (124504030025), we get a palindrome (644534435446).

The spelling of 520030405421 in words is "five hundred twenty billion, thirty million, four hundred five thousand, four hundred twenty-one".