11028721 has 8 divisors (see below), whose sum is σ = 12664800. Its totient is φ = 9498240.

The previous prime is 11028709. The next prime is 11028737. The reversal of 11028721 is 12782011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11028721 - 2⁷ = 11028593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11028692 and 11028701.

It is not an unprimeable number, because it can be changed into a prime (11028751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26176 + ... + 26593.

It is an arithmetic number, because the mean of its divisors is an integer number (1583100).

Almost surely, 2^11028721 is an apocalyptic number.

11028721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11028721 is a deficient number, since it is larger than the sum of its proper divisors (1636079).

11028721 is a wasteful number, since it uses less digits than its factorization.

11028721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52799.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 11028721 is about 3320.9518213910. The cubic root of 11028721 is about 222.5914012394.

The spelling of 11028721 in words is "eleven million, twenty-eight thousand, seven hundred twenty-one".