4550221521 has 8 divisors (see below), whose sum is σ = 6741068960. Its totient is φ = 3033480996.

The previous prime is 4550221499. The next prime is 4550221553. The reversal of 4550221521 is 1251220554.

4550221521 is a `hidden beast` number, since 4 + 5 + 502 + 2 + 152 + 1 = 666.

It is not a de Polignac number, because 4550221521 - 2⁶ = 4550221457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 168526723 = 4550221521 / (4 + 5 + 5 + 0 + 2 + 2 + 1 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4550221591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84263335 + ... + 84263388.

It is an arithmetic number, because the mean of its divisors is an integer number (842633620).

Almost surely, 2^4550221521 is an apocalyptic number.

It is an amenable number.

4550221521 is a deficient number, since it is larger than the sum of its proper divisors (2190847439).

4550221521 is a wasteful number, since it uses less digits than its factorization.

4550221521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168526732 (or 168526726 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 4550221521 is about 67455.3298190736. The cubic root of 4550221521 is about 1657.0826876768.

The spelling of 4550221521 in words is "four billion, five hundred fifty million, two hundred twenty-one thousand, five hundred twenty-one".