9923231021 has 16 divisors (see below), whose sum is σ = 11601318528. Its totient is φ = 8395675200.

The previous prime is 9923231009. The next prime is 9923231027. The reversal of 9923231021 is 1201323299.

It is not a de Polignac number, because 9923231021 - 2⁶ = 9923230957 is a prime.

It is a super-2 number, since 2×9923231021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9923231027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520670 + ... + 539391.

It is an arithmetic number, because the mean of its divisors is an integer number (725082408).

Almost surely, 2^9923231021 is an apocalyptic number.

It is an amenable number.

9923231021 is a deficient number, since it is larger than the sum of its proper divisors (1678087507).

9923231021 is a wasteful number, since it uses less digits than its factorization.

9923231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060132.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 9923231021 is about 99615.4155791161. The cubic root of 9923231021 is about 2148.9073966042.

The spelling of 9923231021 in words is "nine billion, nine hundred twenty-three million, two hundred thirty-one thousand, twenty-one".