11023721 has 2 divisors, whose sum is σ = 11023722. Its totient is φ = 11023720.

The previous prime is 11023717. The next prime is 11023723. The reversal of 11023721 is 12732011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9610000 + 1413721 = 3100^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 11023721 - 2² = 11023717 is a prime.

Together with 11023723, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11023721.

It is not a weakly prime, because it can be changed into another prime (11023723) 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 as a sum of consecutive naturals, namely, 5511860 + 5511861.

It is an arithmetic number, because the mean of its divisors is an integer number (5511861).

Almost surely, 2^11023721 is an apocalyptic number.

It is an amenable number.

11023721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11023721 is an equidigital number, since it uses as much as digits as its factorization.

11023721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 11023721 is about 3320.1989398227. The cubic root of 11023721 is about 222.5577580140.

Adding to 11023721 its reverse (12732011), we get a palindrome (23755732).

The spelling of 11023721 in words is "eleven million, twenty-three thousand, seven hundred twenty-one".