52321221 has 10 divisors (see below), whose sum is σ = 78158982. Its totient is φ = 34880760.

The previous prime is 52321187. The next prime is 52321253. The reversal of 52321221 is 12212325.

It can be written as a sum of positive squares in only one way, i.e., 37344321 + 14976900 = 6111^2 + 3870^2 .

It is not a de Polignac number, because 52321221 - 2²² = 48126917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 52321194 and 52321203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52321921) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 322890 + ... + 323051.

Almost surely, 2^52321221 is an apocalyptic number.

It is an amenable number.

52321221 is a deficient number, since it is larger than the sum of its proper divisors (25837761).

52321221 is an equidigital number, since it uses as much as digits as its factorization.

52321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645953 (or 645944 counting only the distinct ones).

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

The square root of 52321221 is about 7233.3409293355. The cubic root of 52321221 is about 374.0181032540.

Adding to 52321221 its reverse (12212325), we get a palindrome (64533546).

The spelling of 52321221 in words is "fifty-two million, three hundred twenty-one thousand, two hundred twenty-one".