53213045205521 has 4 divisors (see below), whose sum is σ = 53215516918500. Its totient is φ = 53210573492544.

The previous prime is 53213045205503. The next prime is 53213045205539. The reversal of 53213045205521 is 12550254031235.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (53213045205503) and next prime (53213045205539).

It can be written as a sum of positive squares in 2 ways, for example, as 37068431908225 + 16144613297296 = 6088385^2 + 4018036^2 .

It is a cyclic number.

It is not a de Polignac number, because 53213045205521 - 2²² = 53213041011217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53213045207521) 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, 1235824196 + ... + 1235867253.

It is an arithmetic number, because the mean of its divisors is an integer number (13303879229625).

Almost surely, 2^{53213045205521} is an apocalyptic number.

It is an amenable number.

53213045205521 is a deficient number, since it is larger than the sum of its proper divisors (2471712979).

53213045205521 is a wasteful number, since it uses less digits than its factorization.

53213045205521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471712978.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 53213045205521 its reverse (12550254031235), we get a palindrome (65763299236756).

The spelling of 53213045205521 in words is "fifty-three trillion, two hundred thirteen billion, forty-five million, two hundred five thousand, five hundred twenty-one".