30664221 has 16 divisors (see below), whose sum is σ = 48758784. Its totient is φ = 16760304.

The previous prime is 30664219. The next prime is 30664237. The reversal of 30664221 is 12246603.

It is not a de Polignac number, because 30664221 - 2¹ = 30664219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30664191 and 30664200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30664201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31261 + ... + 32226.

It is an arithmetic number, because the mean of its divisors is an integer number (3047424).

Almost surely, 2^30664221 is an apocalyptic number.

It is an amenable number.

30664221 is a deficient number, since it is larger than the sum of its proper divisors (18094563).

30664221 is a wasteful number, since it uses less digits than its factorization.

30664221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63520.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 30664221 is about 5537.5284197916. The cubic root of 30664221 is about 312.9997414146. Note that the first 3 decimals are identical.

The spelling of 30664221 in words is "thirty million, six hundred sixty-four thousand, two hundred twenty-one".