11281621 has 4 divisors (see below), whose sum is σ = 12149452. Its totient is φ = 10413792.

The previous prime is 11281607. The next prime is 11281631. The reversal of 11281621 is 12618211.

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 2842596 + 8439025 = 1686^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 11281621 - 2¹⁹ = 10757333 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11281592 and 11281601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11281631) 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 3 ways as a sum of consecutive naturals, for example, 433896 + ... + 433921.

It is an arithmetic number, because the mean of its divisors is an integer number (3037363).

Almost surely, 2^11281621 is an apocalyptic number.

It is an amenable number.

11281621 is a deficient number, since it is larger than the sum of its proper divisors (867831).

11281621 is an equidigital number, since it uses as much as digits as its factorization.

11281621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867830.

The product of its digits is 192, while the sum is 22.

The square root of 11281621 is about 3358.8124389433. The cubic root of 11281621 is about 224.2799764967.

Adding to 11281621 its reverse (12618211), we get a palindrome (23899832).

The spelling of 11281621 in words is "eleven million, two hundred eighty-one thousand, six hundred twenty-one".