89220721 has 4 divisors (see below), whose sum is σ = 89311744. Its totient is φ = 89129700.

The previous prime is 89220707. The next prime is 89220731. The reversal of 89220721 is 12702298.

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 89220721 - 2⁵ = 89220689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89220731) 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, 44025 + ... + 46006.

It is an arithmetic number, because the mean of its divisors is an integer number (22327936).

Almost surely, 2^89220721 is an apocalyptic number.

It is an amenable number.

89220721 is a deficient number, since it is larger than the sum of its proper divisors (91023).

89220721 is an equidigital number, since it uses as much as digits as its factorization.

89220721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91022.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 89220721 is about 9445.6720777296. The cubic root of 89220721 is about 446.8432921314.

The spelling of 89220721 in words is "eighty-nine million, two hundred twenty thousand, seven hundred twenty-one".