30551221 has 8 divisors (see below), whose sum is σ = 32548320. Its totient is φ = 28593072.

The previous prime is 30551219. The next prime is 30551231. The reversal of 30551221 is 12215503.

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 30551221 - 2¹ = 30551219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30551201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8110 + ... + 11263.

It is an arithmetic number, because the mean of its divisors is an integer number (4068540).

Almost surely, 2^30551221 is an apocalyptic number.

It is an amenable number.

30551221 is a deficient number, since it is larger than the sum of its proper divisors (1997099).

30551221 is a wasteful number, since it uses less digits than its factorization.

30551221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19475.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 30551221 is about 5527.3158947178. The cubic root of 30551221 is about 312.6147921743.

Adding to 30551221 its reverse (12215503), we get a palindrome (42766724).

The spelling of 30551221 in words is "thirty million, five hundred fifty-one thousand, two hundred twenty-one".