52511221 has 16 divisors (see below), whose sum is σ = 61171200. Its totient is φ = 44149248.

The previous prime is 52511203. The next prime is 52511227. The reversal of 52511221 is 12211525.

52511221 = T₁₂₉ + T₁₃₀ + ... + T₆₈₁.

It is a cyclic number.

It is not a de Polignac number, because 52511221 - 2¹³ = 52503029 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 (52511227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148581 + ... + 148933.

It is an arithmetic number, because the mean of its divisors is an integer number (3823200).

Almost surely, 2^52511221 is an apocalyptic number.

It is an amenable number.

52511221 is a deficient number, since it is larger than the sum of its proper divisors (8659979).

52511221 is a wasteful number, since it uses less digits than its factorization.

52511221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708.

The product of its digits is 200, while the sum is 19.

The square root of 52511221 is about 7246.4626542886. The cubic root of 52511221 is about 374.4702944882.

Adding to 52511221 its reverse (12211525), we get a palindrome (64722746).

The spelling of 52511221 in words is "fifty-two million, five hundred eleven thousand, two hundred twenty-one".