30031221 has 16 divisors (see below), whose sum is σ = 43864128. Its totient is φ = 18124800.

The previous prime is 30031217. The next prime is 30031223. The reversal of 30031221 is 12213003.

It is a happy number.

It is not a de Polignac number, because 30031221 - 2² = 30031217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30031197 and 30031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30031223) 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, 6711 + ... + 10251.

It is an arithmetic number, because the mean of its divisors is an integer number (2741508).

Almost surely, 2^30031221 is an apocalyptic number.

It is an amenable number.

30031221 is a deficient number, since it is larger than the sum of its proper divisors (13832907).

30031221 is a wasteful number, since it uses less digits than its factorization.

30031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 30031221 is about 5480.0749082471. The cubic root of 30031221 is about 310.8310031203.

Adding to 30031221 its reverse (12213003), we get a palindrome (42244224).

It can be divided in two parts, 3003 and 1221, that multiplied together give a palindrome (3666663).

The spelling of 30031221 in words is "thirty million, thirty-one thousand, two hundred twenty-one".