11123200721 has 2 divisors, whose sum is σ = 11123200722. Its totient is φ = 11123200720.

The previous prime is 11123200681. The next prime is 11123200769. The reversal of 11123200721 is 12700232111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7184257600 + 3938943121 = 84760^2 + 62761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11123200721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11123200693 and 11123200702.

It is not a weakly prime, because it can be changed into another prime (11123208721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561600360 + 5561600361.

It is an arithmetic number, because the mean of its divisors is an integer number (5561600361).

Almost surely, 2^11123200721 is an apocalyptic number.

It is an amenable number.

11123200721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123200721 is an equidigital number, since it uses as much as digits as its factorization.

11123200721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 11123200721 its reverse (12700232111), we get a palindrome (23823432832).

The spelling of 11123200721 in words is "eleven billion, one hundred twenty-three million, two hundred thousand, seven hundred twenty-one".