30889221 has 16 divisors (see below), whose sum is σ = 47573568. Its totient is φ = 17619200.

The previous prime is 30889219. The next prime is 30889223. The reversal of 30889221 is 12298803.

It is an interprime number because it is at equal distance from previous prime (30889219) and next prime (30889223).

It is a cyclic number.

It is not a de Polignac number, because 30889221 - 2¹ = 30889219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30889223) 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 15 ways as a sum of consecutive naturals, for example, 26970 + ... + 28091.

It is an arithmetic number, because the mean of its divisors is an integer number (2973348).

Almost surely, 2^30889221 is an apocalyptic number.

It is an amenable number.

30889221 is a deficient number, since it is larger than the sum of its proper divisors (16684347).

30889221 is a wasteful number, since it uses less digits than its factorization.

30889221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55092.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 30889221 is about 5557.8072114819. The cubic root of 30889221 is about 313.7634261435.

The spelling of 30889221 in words is "thirty million, eight hundred eighty-nine thousand, two hundred twenty-one".