521271321 has 4 divisors (see below), whose sum is σ = 695028432. Its totient is φ = 347514212.

The previous prime is 521271299. The next prime is 521271329. The reversal of 521271321 is 123172125.

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 521271321 - 2²⁷ = 387053593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521271291 and 521271300.

It is not an unprimeable number, because it can be changed into a prime (521271329) 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, 86878551 + ... + 86878556.

It is an arithmetic number, because the mean of its divisors is an integer number (173757108).

Almost surely, 2^521271321 is an apocalyptic number.

It is an amenable number.

521271321 is a deficient number, since it is larger than the sum of its proper divisors (173757111).

521271321 is a wasteful number, since it uses less digits than its factorization.

521271321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173757110.

The product of its digits is 840, while the sum is 24.

The square root of 521271321 is about 22831.3670418571. The cubic root of 521271321 is about 804.7999559510.

The spelling of 521271321 in words is "five hundred twenty-one million, two hundred seventy-one thousand, three hundred twenty-one".