11212521 has 16 divisors (see below), whose sum is σ = 15410304. Its totient is φ = 7248384.

The previous prime is 11212519. The next prime is 11212529. The reversal of 11212521 is 12521211.

It is not a de Polignac number, because 11212521 - 2¹ = 11212519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11212521.

It is not an unprimeable number, because it can be changed into a prime (11212529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15060 + ... + 15786.

It is an arithmetic number, because the mean of its divisors is an integer number (963144).

Almost surely, 2^11212521 is an apocalyptic number.

It is an amenable number.

11212521 is a deficient number, since it is larger than the sum of its proper divisors (4197783).

11212521 is an equidigital number, since it uses as much as digits as its factorization.

11212521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its digits is 40, while the sum is 15.

The square root of 11212521 is about 3348.5102657749. The cubic root of 11212521 is about 223.8211329862.

Adding to 11212521 its reverse (12521211), we get a palindrome (23733732).

It can be divided in two parts, 1121252 and 1, that added together give a triangular number (1121253 = T₁₄₉₇).

The spelling of 11212521 in words is "eleven million, two hundred twelve thousand, five hundred twenty-one".