9955487021 has 8 divisors (see below), whose sum is σ = 9976143288. Its totient is φ = 9934848000.

The previous prime is 9955486997. The next prime is 9955487117. The reversal of 9955487021 is 1207845599.

It can be written as a sum of positive squares in 4 ways, for example, as 4066612900 + 5888874121 = 63770^2 + 76739^2 .

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 9955487021 - 2²² = 9951292717 is a prime.

It is a super-2 number, since 2×9955487021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9655487021) 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, 2152091 + ... + 2156711.

It is an arithmetic number, because the mean of its divisors is an integer number (1247017911).

Almost surely, 2^9955487021 is an apocalyptic number.

It is an amenable number.

9955487021 is a deficient number, since it is larger than the sum of its proper divisors (20656267).

9955487021 is a wasteful number, since it uses less digits than its factorization.

9955487021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8623.

The product of its (nonzero) digits is 907200, while the sum is 50.

The square root of 9955487021 is about 99777.1868765601. The cubic root of 9955487021 is about 2151.2332582767.

The spelling of 9955487021 in words is "nine billion, nine hundred fifty-five million, four hundred eighty-seven thousand, twenty-one".