53365621 has 4 divisors (see below), whose sum is σ = 53594892. Its totient is φ = 53136352.

The previous prime is 53365607. The next prime is 53365643. The reversal of 53365621 is 12656335.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12656335 = 5 ⋅2531267.

It can be written as a sum of positive squares in 2 ways, for example, as 26894596 + 26471025 = 5186^2 + 5145^2 .

It is a cyclic number.

It is not a de Polignac number, because 53365621 - 2¹³ = 53357429 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53365651) 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, 114286 + ... + 114751.

It is an arithmetic number, because the mean of its divisors is an integer number (13398723).

Almost surely, 2^53365621 is an apocalyptic number.

It is an amenable number.

53365621 is a deficient number, since it is larger than the sum of its proper divisors (229271).

53365621 is a wasteful number, since it uses less digits than its factorization.

53365621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229270.

The product of its digits is 16200, while the sum is 31.

The square root of 53365621 is about 7305.1776843551. The cubic root of 53365621 is about 376.4903558731.

The spelling of 53365621 in words is "fifty-three million, three hundred sixty-five thousand, six hundred twenty-one".