30055221 has 24 divisors (see below), whose sum is σ = 49786880. Its totient is φ = 17114976.

The previous prime is 30055217. The next prime is 30055229. The reversal of 30055221 is 12255003.

It is a happy number.

It is not a de Polignac number, because 30055221 - 2² = 30055217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30055194 and 30055203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30055229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22860 + ... + 24138.

Almost surely, 2^30055221 is an apocalyptic number.

It is an amenable number.

30055221 is a deficient number, since it is larger than the sum of its proper divisors (19731659).

30055221 is a wasteful number, since it uses less digits than its factorization.

30055221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665 (or 1662 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 30055221 is about 5482.2642220163. The cubic root of 30055221 is about 310.9137831678.

It can be divided in two parts, 30055 and 221, that added together give a square (30276 = 174²).

The spelling of 30055221 in words is "thirty million, fifty-five thousand, two hundred twenty-one".