30221581 has 8 divisors (see below), whose sum is σ = 32604824. Its totient is φ = 27846720.

The previous prime is 30221557. The next prime is 30221591. The reversal of 30221581 is 18512203.

It can be written as a sum of positive squares in 4 ways, for example, as 10949481 + 19272100 = 3309^2 + 4390^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 30221581 - 2⁵ = 30221549 is a prime.

It is a super-2 number, since 2×30221581² = 1826687916279122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30221591) 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, 6835 + ... + 10351.

It is an arithmetic number, because the mean of its divisors is an integer number (4075603).

Almost surely, 2^30221581 is an apocalyptic number.

It is an amenable number.

30221581 is a deficient number, since it is larger than the sum of its proper divisors (2383243).

30221581 is a wasteful number, since it uses less digits than its factorization.

30221581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 30221581 is about 5497.4158474687. The cubic root of 30221581 is about 311.4863789329.

Adding to 30221581 its reverse (18512203), we get a palindrome (48733784).

The spelling of 30221581 in words is "thirty million, two hundred twenty-one thousand, five hundred eighty-one".