521320401399 has 8 divisors (see below), whose sum is σ = 794392992640. Its totient is φ = 297897372216.

The previous prime is 521320401391. The next prime is 521320401403. The reversal of 521320401399 is 993104023125.

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

It is not a de Polignac number, because 521320401399 - 2³ = 521320401391 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 (521320401391) 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, 12412390489 + ... + 12412390530.

It is an arithmetic number, because the mean of its divisors is an integer number (99299124080).

Almost surely, 2^521320401399 is an apocalyptic number.

521320401399 is a deficient number, since it is larger than the sum of its proper divisors (273072591241).

521320401399 is a wasteful number, since it uses less digits than its factorization.

521320401399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24824781029.

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 521320401399 in words is "five hundred twenty-one billion, three hundred twenty million, four hundred one thousand, three hundred ninety-nine".