53505523042221 has 4 divisors (see below), whose sum is σ = 71340697389632. Its totient is φ = 35670348694812.

The previous prime is 53505523042217. The next prime is 53505523042241. The reversal of 53505523042221 is 12224032550535.

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 not a de Polignac number, because 53505523042221 - 2² = 53505523042217 is a prime.

It is a super-2 number, since 2×53505523042221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 53505523042221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53505523042201) 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, 8917587173701 + ... + 8917587173706.

It is an arithmetic number, because the mean of its divisors is an integer number (17835174347408).

Almost surely, 2^{53505523042221} is an apocalyptic number.

It is an amenable number.

53505523042221 is a deficient number, since it is larger than the sum of its proper divisors (17835174347411).

53505523042221 is a wasteful number, since it uses less digits than its factorization.

53505523042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17835174347410.

The product of its (nonzero) digits is 360000, while the sum is 39.

Adding to 53505523042221 its reverse (12224032550535), we get a palindrome (65729555592756).

The spelling of 53505523042221 in words is "fifty-three trillion, five hundred five billion, five hundred twenty-three million, forty-two thousand, two hundred twenty-one".