9875923021 has 4 divisors (see below), whose sum is σ = 9890598172. Its totient is φ = 9861247872.

The previous prime is 9875923009. The next prime is 9875923061. The reversal of 9875923021 is 1203295789.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1714788100 + 8161134921 = 41410^2 + 90339^2 .

It is a cyclic number.

It is not a de Polignac number, because 9875923021 - 2²⁷ = 9741705293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9875923061) 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, 7336566 + ... + 7337911.

It is an arithmetic number, because the mean of its divisors is an integer number (2472649543).

Almost surely, 2^9875923021 is an apocalyptic number.

It is an amenable number.

9875923021 is a deficient number, since it is larger than the sum of its proper divisors (14675151).

9875923021 is a wasteful number, since it uses less digits than its factorization.

9875923021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14675150.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 9875923021 is about 99377.6786859101. The cubic root of 9875923021 is about 2145.4870559170.

The spelling of 9875923021 in words is "nine billion, eight hundred seventy-five million, nine hundred twenty-three thousand, twenty-one".