521232210421321 has 4 divisors (see below), whose sum is σ = 595693954767232. Its totient is φ = 446770466075412.

The previous prime is 521232210421313. The next prime is 521232210421333. The reversal of 521232210421321 is 123124012232125.

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 521232210421321 - 2³ = 521232210421313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521232210401321) 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, 37230872172945 + ... + 37230872172958.

It is an arithmetic number, because the mean of its divisors is an integer number (148923488691808).

Almost surely, 2^{521232210421321} is an apocalyptic number.

It is an amenable number.

521232210421321 is a deficient number, since it is larger than the sum of its proper divisors (74461744345911).

521232210421321 is an equidigital number, since it uses as much as digits as its factorization.

521232210421321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74461744345910.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 521232210421321 its reverse (123124012232125), we get a palindrome (644356222653446).

The spelling of 521232210421321 in words is "five hundred twenty-one trillion, two hundred thirty-two billion, two hundred ten million, four hundred twenty-one thousand, three hundred twenty-one".