30542221 has 4 divisors (see below), whose sum is σ = 30553600. Its totient is φ = 30530844.

The previous prime is 30542207. The next prime is 30542243. The reversal of 30542221 is 12224503.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 30542221 - 2⁷ = 30542093 is a prime.

It is a super-2 number, since 2×30542221² = 1865654527225682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30542261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820 + ... + 7858.

It is an arithmetic number, because the mean of its divisors is an integer number (7638400).

Almost surely, 2^30542221 is an apocalyptic number.

It is an amenable number.

30542221 is a deficient number, since it is larger than the sum of its proper divisors (11379).

30542221 is an equidigital number, since it uses as much as digits as its factorization.

30542221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11378.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 30542221 is about 5526.5016963718. The cubic root of 30542221 is about 312.5840917161.

Adding to 30542221 its reverse (12224503), we get a palindrome (42766724).

The spelling of 30542221 in words is "thirty million, five hundred forty-two thousand, two hundred twenty-one".