10447721 has 4 divisors (see below), whose sum is σ = 10594944. Its totient is φ = 10300500.

The previous prime is 10447711. The next prime is 10447747. The reversal of 10447721 is 12774401.

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 10447721 - 2¹⁰ = 10446697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10447711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73505 + ... + 73646.

It is an arithmetic number, because the mean of its divisors is an integer number (2648736).

Almost surely, 2^10447721 is an apocalyptic number.

It is an amenable number.

10447721 is a deficient number, since it is larger than the sum of its proper divisors (147223).

10447721 is an equidigital number, since it uses as much as digits as its factorization.

10447721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147222.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 10447721 is about 3232.2934582120. The cubic root of 10447721 is about 218.6119285433.

The spelling of 10447721 in words is "ten million, four hundred forty-seven thousand, seven hundred twenty-one".