9982207921 has 15 divisors (see below), whose sum is σ = 11650930361. Its totient is φ = 8551981956.

The previous prime is 9982207919. The next prime is 9982207957. The reversal of 9982207921 is 1297022899.

The square root of 9982207921 is 99911.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 9982207921 - 2¹ = 9982207919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (9982207981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4894620 + ... + 4896658.

Almost surely, 2^9982207921 is an apocalyptic number.

9982207921 is the 99911-st square number.

9982207921 is the 49956-th centered octagonal number.

It is an amenable number.

9982207921 is a deficient number, since it is larger than the sum of its proper divisors (1668722440).

9982207921 is an frugal number, since it uses more digits than its factorization.

9982207921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106 (or 2046 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

The cubic root of 9982207921 is about 2153.1562024266.

Multiplying 9982207921 by its sum of digits (49), we get a square (489128188129 = 699377²).

9982207921 divided by its sum of digits (49) gives a square (203718529 = 14273²).

The spelling of 9982207921 in words is "nine billion, nine hundred eighty-two million, two hundred seven thousand, nine hundred twenty-one".