10988721 has 6 divisors (see below), whose sum is σ = 15872610. Its totient is φ = 7325808.

The previous prime is 10988717. The next prime is 10988729. The reversal of 10988721 is 12788901.

It can be written as a sum of positive squares in only one way, i.e., 6426225 + 4562496 = 2535^2 + 2136^2 .

It is not a de Polignac number, because 10988721 - 2² = 10988717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10988729) 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 5 ways as a sum of consecutive naturals, for example, 610476 + ... + 610493.

It is an arithmetic number, because the mean of its divisors is an integer number (2645435).

Almost surely, 2^10988721 is an apocalyptic number.

It is an amenable number.

10988721 is a deficient number, since it is larger than the sum of its proper divisors (4883889).

10988721 is a wasteful number, since it uses less digits than its factorization.

10988721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220975 (or 1220972 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 10988721 is about 3314.9239810288. The cubic root of 10988721 is about 222.3219701181.

The spelling of 10988721 in words is "ten million, nine hundred eighty-eight thousand, seven hundred twenty-one".