53510221 has 4 divisors (see below), whose sum is σ = 53869500. Its totient is φ = 53150944.

The previous prime is 53510209. The next prime is 53510239. The reversal of 53510221 is 12201535.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5692996 + 47817225 = 2386^2 + 6915^2 .

It is a cyclic number.

It is not a de Polignac number, because 53510221 - 2¹⁵ = 53477453 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 (53510291) 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, 179416 + ... + 179713.

It is an arithmetic number, because the mean of its divisors is an integer number (13467375).

Almost surely, 2^53510221 is an apocalyptic number.

It is an amenable number.

53510221 is a deficient number, since it is larger than the sum of its proper divisors (359279).

53510221 is a wasteful number, since it uses less digits than its factorization.

53510221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359278.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 53510221 is about 7315.0680789723. The cubic root of 53510221 is about 376.8300964994.

Adding to 53510221 its reverse (12201535), we get a palindrome (65711756).

The spelling of 53510221 in words is "fifty-three million, five hundred ten thousand, two hundred twenty-one".