9921353231 has 8 divisors (see below), whose sum is σ = 10039011840. Its totient is φ = 9803832192.

The previous prime is 9921353191. The next prime is 9921353257. The reversal of 9921353231 is 1323531299.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9921353231 - 2¹⁴ = 9921336847 is a prime.

It is a super-2 number, since 2×9921353231² (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 (9921355231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114491 + ... + 181523.

It is an arithmetic number, because the mean of its divisors is an integer number (1254876480).

Almost surely, 2^9921353231 is an apocalyptic number.

9921353231 is a deficient number, since it is larger than the sum of its proper divisors (117658609).

9921353231 is a wasteful number, since it uses less digits than its factorization.

9921353231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68785.

The product of its digits is 43740, while the sum is 38.

The square root of 9921353231 is about 99605.9899353448. The cubic root of 9921353231 is about 2148.7718409112.

The spelling of 9921353231 in words is "nine billion, nine hundred twenty-one million, three hundred fifty-three thousand, two hundred thirty-one".