52231221 has 24 divisors (see below), whose sum is σ = 87444864. Its totient is φ = 29423520.

The previous prime is 52231219. The next prime is 52231243. The reversal of 52231221 is 12213225.

It is not a de Polignac number, because 52231221 - 2¹ = 52231219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 52231194 and 52231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52231211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1366 + ... + 10311.

It is an arithmetic number, because the mean of its divisors is an integer number (3643536).

Almost surely, 2^52231221 is an apocalyptic number.

It is an amenable number.

52231221 is a deficient number, since it is larger than the sum of its proper divisors (35213643).

52231221 is a wasteful number, since it uses less digits than its factorization.

52231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11761 (or 11758 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 52231221 is about 7227.1170600731. The cubic root of 52231221 is about 373.8035252552.

Adding to 52231221 its reverse (12213225), we get a palindrome (64444446).

The spelling of 52231221 in words is "fifty-two million, two hundred thirty-one thousand, two hundred twenty-one".