30012221 has 4 divisors (see below), whose sum is σ = 30037500. Its totient is φ = 29986944.

The previous prime is 30012211. The next prime is 30012223. The reversal of 30012221 is 12221003.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24304900 + 5707321 = 4930^2 + 2389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30012221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30012223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10766 + ... + 13263.

It is an arithmetic number, because the mean of its divisors is an integer number (7509375).

Almost surely, 2^30012221 is an apocalyptic number.

It is an amenable number.

30012221 is a deficient number, since it is larger than the sum of its proper divisors (25279).

30012221 is a wasteful number, since it uses less digits than its factorization.

30012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25278.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 30012221 is about 5478.3410810208. The cubic root of 30012221 is about 310.7654376323.

Adding to 30012221 its reverse (12221003), we get a palindrome (42233224).

It can be divided in two parts, 300 and 12221, that added together give a palindrome (12521).

The spelling of 30012221 in words is "thirty million, twelve thousand, two hundred twenty-one".