52021231 has 4 divisors (see below), whose sum is σ = 52498600. Its totient is φ = 51543864.

The previous prime is 52021219. The next prime is 52021247. The reversal of 52021231 is 13212025.

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

It is a cyclic number.

It is not a de Polignac number, because 52021231 - 2¹⁵ = 51988463 is a prime.

It is a super-2 number, since 2×52021231² = 5412416949510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238521 + ... + 238738.

It is an arithmetic number, because the mean of its divisors is an integer number (13124650).

Almost surely, 2^52021231 is an apocalyptic number.

52021231 is a deficient number, since it is larger than the sum of its proper divisors (477369).

52021231 is a wasteful number, since it uses less digits than its factorization.

52021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477368.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 52021231 is about 7212.5745056810. The cubic root of 52021231 is about 373.3019068111.

Adding to 52021231 its reverse (13212025), we get a palindrome (65233256).

The spelling of 52021231 in words is "fifty-two million, twenty-one thousand, two hundred thirty-one".