9941721 has 16 divisors (see below), whose sum is σ = 13704768. Its totient is φ = 6406400.

The previous prime is 9941717. The next prime is 9941749. The reversal of 9941721 is 1271499.

It is a cyclic number.

It is not a de Polignac number, because 9941721 - 2² = 9941717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9941761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15805 + ... + 16421.

It is an arithmetic number, because the mean of its divisors is an integer number (856548).

Almost surely, 2^9941721 is an apocalyptic number.

It is an amenable number.

9941721 is a deficient number, since it is larger than the sum of its proper divisors (3763047).

9941721 is a wasteful number, since it uses less digits than its factorization.

9941721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its digits is 4536, while the sum is 33.

The square root of 9941721 is about 3153.0494763007. The cubic root of 9941721 is about 215.0241256504.

The spelling of 9941721 in words is "nine million, nine hundred forty-one thousand, seven hundred twenty-one".