30015221 has 8 divisors (see below), whose sum is σ = 30406200. Its totient is φ = 29626560.

The previous prime is 30015169. The next prime is 30015229. The reversal of 30015221 is 12251003.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9891025 + 20124196 = 3145^2 + 4486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30015221 is a prime.

It is a super-4 number, since 4×30015221⁴ (a number of 31 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30015196 and 30015205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30015229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55211 + ... + 55751.

It is an arithmetic number, because the mean of its divisors is an integer number (3800775).

Almost surely, 2^30015221 is an apocalyptic number.

It is an amenable number.

30015221 is a deficient number, since it is larger than the sum of its proper divisors (390979).

30015221 is a wasteful number, since it uses less digits than its factorization.

30015221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 30015221 is about 5478.6148796936. The cubic root of 30015221 is about 310.7757919171.

Adding to 30015221 its reverse (12251003), we get a palindrome (42266224).

The spelling of 30015221 in words is "thirty million, fifteen thousand, two hundred twenty-one".