11125721 has 4 divisors (see below), whose sum is σ = 11609472. Its totient is φ = 10641972.

The previous prime is 11125717. The next prime is 11125727. The reversal of 11125721 is 12752111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11125721 - 2² = 11125717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11125693 and 11125702.

It is not an unprimeable number, because it can be changed into a prime (11125727) 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 3 ways as a sum of consecutive naturals, for example, 241841 + ... + 241886.

It is an arithmetic number, because the mean of its divisors is an integer number (2902368).

Almost surely, 2^11125721 is an apocalyptic number.

It is an amenable number.

11125721 is a deficient number, since it is larger than the sum of its proper divisors (483751).

11125721 is an equidigital number, since it uses as much as digits as its factorization.

11125721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483750.

The product of its digits is 140, while the sum is 20.

The square root of 11125721 is about 3335.5240967500. The cubic root of 11125721 is about 223.2420772686.

Adding to 11125721 its reverse (12752111), we get a palindrome (23877832).

The spelling of 11125721 in words is "eleven million, one hundred twenty-five thousand, seven hundred twenty-one".