9921814223 has 4 divisors (see below), whose sum is σ = 9928758840. Its totient is φ = 9914869608.

The previous prime is 9921814219. The next prime is 9921814241. The reversal of 9921814223 is 3224181299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3224181299 = 331 ⋅9740729.

It is a cyclic number.

It is not a de Polignac number, because 9921814223 - 2² = 9921814219 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 (9921814423) 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, 3470165 + ... + 3473022.

It is an arithmetic number, because the mean of its divisors is an integer number (2482189710).

Almost surely, 2^9921814223 is an apocalyptic number.

9921814223 is a deficient number, since it is larger than the sum of its proper divisors (6944617).

9921814223 is a wasteful number, since it uses less digits than its factorization.

9921814223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944616.

The product of its digits is 62208, while the sum is 41.

The square root of 9921814223 is about 99608.3039861637. The cubic root of 9921814223 is about 2148.8051210247.

The spelling of 9921814223 in words is "nine billion, nine hundred twenty-one million, eight hundred fourteen thousand, two hundred twenty-three".