10531221 has 16 divisors (see below), whose sum is σ = 14327808. Its totient is φ = 6879600.

The previous prime is 10531201. The next prime is 10531229. The reversal of 10531221 is 12213501.

10531221 = 216² + 217² + ... + 346².

It is not a de Polignac number, because 10531221 - 2⁷ = 10531093 is a prime.

It is a super-2 number, since 2×10531221² = 221813231501682, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10531221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10531229) 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, 49806 + ... + 50016.

It is an arithmetic number, because the mean of its divisors is an integer number (895488).

Almost surely, 2^10531221 is an apocalyptic number.

It is an amenable number.

10531221 is a deficient number, since it is larger than the sum of its proper divisors (3796587).

10531221 is a wasteful number, since it uses less digits than its factorization.

10531221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 10531221 is about 3245.1842782807. The cubic root of 10531221 is about 219.1927786906.

Adding to 10531221 its reverse (12213501), we get a palindrome (22744722).

The spelling of 10531221 in words is "ten million, five hundred thirty-one thousand, two hundred twenty-one".