9955537221 has 48 divisors (see below), whose sum is σ = 16086530880. Its totient is φ = 5455860480.

The previous prime is 9955537199. The next prime is 9955537259. The reversal of 9955537221 is 1227355599.

It is not a de Polignac number, because 9955537221 - 2⁶ = 9955537157 is a prime.

It is a super-2 number, since 2×9955537221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9955547221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 341595 + ... + 369591.

It is an arithmetic number, because the mean of its divisors is an integer number (335136060).

Almost surely, 2^9955537221 is an apocalyptic number.

It is an amenable number.

9955537221 is a deficient number, since it is larger than the sum of its proper divisors (6130993659).

9955537221 is a wasteful number, since it uses less digits than its factorization.

9955537221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28114 (or 28107 counting only the distinct ones).

The product of its digits is 850500, while the sum is 48.

The square root of 9955537221 is about 99777.4384367528. The cubic root of 9955537221 is about 2151.2368740960.

The spelling of 9955537221 in words is "nine billion, nine hundred fifty-five million, five hundred thirty-seven thousand, two hundred twenty-one".