521407240343 has 8 divisors (see below), whose sum is σ = 569449180800. Its totient is φ = 473472180280.

The previous prime is 521407240279. The next prime is 521407240399. The reversal of 521407240343 is 343042704125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521407240343 - 2⁶ = 521407240279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521407240843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26709893 + ... + 26729406.

It is an arithmetic number, because the mean of its divisors is an integer number (71181147600).

Almost surely, 2^521407240343 is an apocalyptic number.

521407240343 is a deficient number, since it is larger than the sum of its proper divisors (48041940457).

521407240343 is a wasteful number, since it uses less digits than its factorization.

521407240343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53440197.

The product of its (nonzero) digits is 80640, while the sum is 35.

Adding to 521407240343 its reverse (343042704125), we get a palindrome (864449944468).

The spelling of 521407240343 in words is "five hundred twenty-one billion, four hundred seven million, two hundred forty thousand, three hundred forty-three".