9960021 has 24 divisors (see below), whose sum is σ = 15375360. Its totient is φ = 6199200.

The previous prime is 9959987. The next prime is 9960023. The reversal of 9960021 is 1200699.

It is a happy number.

It is not a de Polignac number, because 9960021 - 2¹¹ = 9957973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9960023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7476 + ... + 8706.

It is an arithmetic number, because the mean of its divisors is an integer number (640640).

Almost surely, 2^9960021 is an apocalyptic number.

It is an amenable number.

9960021 is a deficient number, since it is larger than the sum of its proper divisors (5415339).

9960021 is a wasteful number, since it uses less digits than its factorization.

9960021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297 (or 1294 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 9960021 is about 3155.9500946625. The cubic root of 9960021 is about 215.1559783943.

The spelling of 9960021 in words is "nine million, nine hundred sixty thousand, twenty-one".