10520221 has 4 divisors (see below), whose sum is σ = 10533600. Its totient is φ = 10506844.

The previous prime is 10520219. The next prime is 10520227. The reversal of 10520221 is 12202501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12202501 = 61 ⋅200041.

It is a cyclic number.

It is not a de Polignac number, because 10520221 - 2¹ = 10520219 is a prime.

It is a super-2 number, since 2×10520221² = 221350099777682, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10520227) 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, 5431 + ... + 7108.

It is an arithmetic number, because the mean of its divisors is an integer number (2633400).

Almost surely, 2^10520221 is an apocalyptic number.

It is an amenable number.

10520221 is a deficient number, since it is larger than the sum of its proper divisors (13379).

10520221 is an equidigital number, since it uses as much as digits as its factorization.

10520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13378.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 10520221 is about 3243.4890164759. The cubic root of 10520221 is about 219.1164355158.

Adding to 10520221 its reverse (12202501), we get a palindrome (22722722).

The spelling of 10520221 in words is "ten million, five hundred twenty thousand, two hundred twenty-one".