9921020 has 12 divisors (see below), whose sum is σ = 20834184. Its totient is φ = 3968400.

The previous prime is 9921019. The next prime is 9921053. The reversal of 9921020 is 201299.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248006 + ... + 248045.

It is an arithmetic number, because the mean of its divisors is an integer number (1736182).

Almost surely, 2^9921020 is an apocalyptic number.

It is an amenable number.

9921020 is an abundant number, since it is smaller than the sum of its proper divisors (10913164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9921020 is a wasteful number, since it uses less digits than its factorization.

9921020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496060 (or 496058 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 9921020 is about 3149.7650706045. The cubic root of 9921020 is about 214.8747783527.

The spelling of 9921020 in words is "nine million, nine hundred twenty-one thousand, twenty".