9918221089 has 4 divisors (see below), whose sum is σ = 11335109824. Its totient is φ = 8501332356.

The previous prime is 9918221081. The next prime is 9918221099. The reversal of 9918221089 is 9801228199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9918221089 - 2³ = 9918221081 is a prime.

It is a super-2 number, since 2×9918221089² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9918221081) 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, 708444357 + ... + 708444370.

It is an arithmetic number, because the mean of its divisors is an integer number (2833777456).

Almost surely, 2^9918221089 is an apocalyptic number.

It is an amenable number.

9918221089 is a deficient number, since it is larger than the sum of its proper divisors (1416888735).

9918221089 is a wasteful number, since it uses less digits than its factorization.

9918221089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416888734.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 9918221089 is about 99590.2660353912. The cubic root of 9918221089 is about 2148.5456967975.

The spelling of 9918221089 in words is "nine billion, nine hundred eighteen million, two hundred twenty-one thousand, eighty-nine".