53543534221 has 4 divisors (see below), whose sum is σ = 53543999200. Its totient is φ = 53543069244.

The previous prime is 53543534189. The next prime is 53543534249. The reversal of 53543534221 is 12243534535.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 53543534221 - 2⁵ = 53543534189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53543534021) 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, 82450 + ... + 337468.

It is an arithmetic number, because the mean of its divisors is an integer number (13385999800).

Almost surely, 2^53543534221 is an apocalyptic number.

It is an amenable number.

53543534221 is a deficient number, since it is larger than the sum of its proper divisors (464979).

53543534221 is a wasteful number, since it uses less digits than its factorization.

53543534221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464978.

The product of its digits is 216000, while the sum is 37.

The spelling of 53543534221 in words is "fifty-three billion, five hundred forty-three million, five hundred thirty-four thousand, two hundred twenty-one".