10998721 has 4 divisors (see below), whose sum is σ = 11185200. Its totient is φ = 10812244.

The previous prime is 10998703. The next prime is 10998737. The reversal of 10998721 is 12789901.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12789901 = 37 ⋅345673.

It is a cyclic number.

It is not a de Polignac number, because 10998721 - 2⁷ = 10998593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10998781) 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, 93151 + ... + 93268.

It is an arithmetic number, because the mean of its divisors is an integer number (2796300).

Almost surely, 2^10998721 is an apocalyptic number.

It is an amenable number.

10998721 is a deficient number, since it is larger than the sum of its proper divisors (186479).

10998721 is an equidigital number, since it uses as much as digits as its factorization.

10998721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186478.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 10998721 is about 3316.4319682454. The cubic root of 10998721 is about 222.3893891152.

The spelling of 10998721 in words is "ten million, nine hundred ninety-eight thousand, seven hundred twenty-one".