53521031521 has 4 divisors (see below), whose sum is σ = 53521848000. Its totient is φ = 53520215044.

The previous prime is 53521031513. The next prime is 53521031527. The reversal of 53521031521 is 12513012535.

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 53521031521 - 2³ = 53521031513 is a prime.

It is a super-3 number, since 3×53521031521³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53521031521.

It is not an unprimeable number, because it can be changed into a prime (53521031527) 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, 300421 + ... + 444178.

It is an arithmetic number, because the mean of its divisors is an integer number (13380462000).

Almost surely, 2^53521031521 is an apocalyptic number.

It is an amenable number.

53521031521 is a deficient number, since it is larger than the sum of its proper divisors (816479).

53521031521 is an equidigital number, since it uses as much as digits as its factorization.

53521031521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816478.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 53521031521 in words is "fifty-three billion, five hundred twenty-one million, thirty-one thousand, five hundred twenty-one".