52215221 has 16 divisors (see below), whose sum is σ = 55880064. Its totient is φ = 48685824.

The previous prime is 52215199. The next prime is 52215223. The reversal of 52215221 is 12251225.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 52215221 - 2⁶ = 52215157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 52215193 and 52215202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52215223) 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, 229910 + ... + 230136.

It is an arithmetic number, because the mean of its divisors is an integer number (3492504).

Almost surely, 2^52215221 is an apocalyptic number.

It is an amenable number.

52215221 is a deficient number, since it is larger than the sum of its proper divisors (3664843).

52215221 is a wasteful number, since it uses less digits than its factorization.

52215221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460.

The product of its digits is 400, while the sum is 20.

The square root of 52215221 is about 7226.0100332064. The cubic root of 52215221 is about 373.7653522551.

Adding to 52215221 its reverse (12251225), we get a palindrome (64466446).

The spelling of 52215221 in words is "fifty-two million, two hundred fifteen thousand, two hundred twenty-one".