9944002121 has 4 divisors (see below), whose sum is σ = 9947727744. Its totient is φ = 9940276500.

The previous prime is 9944002099. The next prime is 9944002139. The reversal of 9944002121 is 1212004499.

9944002121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-9944002121 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 (9944002171) 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, 1858805 + ... + 1864146.

It is an arithmetic number, because the mean of its divisors is an integer number (2486931936).

Almost surely, 2^9944002121 is an apocalyptic number.

It is an amenable number.

9944002121 is a deficient number, since it is larger than the sum of its proper divisors (3725623).

9944002121 is a wasteful number, since it uses less digits than its factorization.

9944002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725622.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 9944002121 is about 99719.6175333620. The cubic root of 9944002121 is about 2150.4057010497.

The spelling of 9944002121 in words is "nine billion, nine hundred forty-four million, two thousand, one hundred twenty-one".