30221724 has 48 divisors (see below), whose sum is σ = 79252992. Its totient is φ = 8893632.

The previous prime is 30221707. The next prime is 30221729. The reversal of 30221724 is 42712203.

It is a self number, because there is not a number n which added to its sum of digits gives 30221724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30221729) 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, 624 + ... + 7799.

It is an arithmetic number, because the mean of its divisors is an integer number (1651104).

Almost surely, 2^30221724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30221724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39626496).

30221724 is an abundant number, since it is smaller than the sum of its proper divisors (49031268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30221724 is a wasteful number, since it uses less digits than its factorization.

30221724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8466 (or 8464 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 30221724 is about 5497.4288535642. The cubic root of 30221724 is about 311.4868702206.

Adding to 30221724 its reverse (42712203), we get a palindrome (72933927).

The spelling of 30221724 in words is "thirty million, two hundred twenty-one thousand, seven hundred twenty-four".