10511221 has 16 divisors (see below), whose sum is σ = 12570624. Its totient is φ = 8601264.

The previous prime is 10511183. The next prime is 10511227. The reversal of 10511221 is 12211501.

It is not a de Polignac number, because 10511221 - 2¹¹ = 10509173 is a prime.

It is a super-2 number, since 2×10511221² = 220971533821682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10511227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13776 + ... + 14518.

It is an arithmetic number, because the mean of its divisors is an integer number (785664).

Almost surely, 2^10511221 is an apocalyptic number.

It is an amenable number.

10511221 is a deficient number, since it is larger than the sum of its proper divisors (2059403).

10511221 is an equidigital number, since it uses as much as digits as its factorization.

10511221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 10511221 is about 3242.1013247584. The cubic root of 10511221 is about 219.0539333261.

Adding to 10511221 its reverse (12211501), we get a palindrome (22722722).

The spelling of 10511221 in words is "ten million, five hundred eleven thousand, two hundred twenty-one".