52013221 has 4 divisors (see below), whose sum is σ = 56014252. Its totient is φ = 48012192.

The previous prime is 52013219. The next prime is 52013237. The reversal of 52013221 is 12231025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14668900 + 37344321 = 3830^2 + 6111^2 .

It is a cyclic number.

It is not a de Polignac number, because 52013221 - 2¹ = 52013219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52013195 and 52013204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52013201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000496 + ... + 2000521.

It is an arithmetic number, because the mean of its divisors is an integer number (14003563).

Almost surely, 2^52013221 is an apocalyptic number.

It is an amenable number.

52013221 is a deficient number, since it is larger than the sum of its proper divisors (4001031).

52013221 is a wasteful number, since it uses less digits than its factorization.

52013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001030.

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

The square root of 52013221 is about 7212.0192040787. The cubic root of 52013221 is about 373.2827460333.

Adding to 52013221 its reverse (12231025), we get a palindrome (64244246).

The spelling of 52013221 in words is "fifty-two million, thirteen thousand, two hundred twenty-one".