8801721 has 12 divisors (see below), whose sum is σ = 12789348. Its totient is φ = 5832864.

The previous prime is 8801717. The next prime is 8801729. The reversal of 8801721 is 1271088.

8801721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7502121 + 1299600 = 2739^2 + 1140^2 .

It is not a de Polignac number, because 8801721 - 2² = 8801717 is a prime.

8801721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8801729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1270 + ... + 4383.

It is an arithmetic number, because the mean of its divisors is an integer number (1065779).

Almost surely, 2^8801721 is an apocalyptic number.

It is an amenable number.

8801721 is a deficient number, since it is larger than the sum of its proper divisors (3987627).

8801721 is a wasteful number, since it uses less digits than its factorization.

8801721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832 (or 5829 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 8801721 is about 2966.7694551481. The cubic root of 8801721 is about 206.4694809570.

It can be divided in two parts, 880 and 1721, that added together give a square (2601 = 51²).

The spelling of 8801721 in words is "eight million, eight hundred one thousand, seven hundred twenty-one".