30221440 has 32 divisors (see below), whose sum is σ = 72249660. Its totient is φ = 12088320.

The previous prime is 30221431. The next prime is 30221441. The reversal of 30221440 is 4412203.

It can be written as a sum of positive squares in 2 ways, for example, as 28643904 + 1577536 = 5352^2 + 1256^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (30221441) 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, 22971 + ... + 24250.

Almost surely, 2^30221440 is an apocalyptic number.

It is an amenable number.

30221440 is an abundant number, since it is smaller than the sum of its proper divisors (42028220).

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

30221440 is an equidigital number, since it uses as much as digits as its factorization.

30221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47240 (or 47228 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 30221440 is about 5497.4030232465. The cubic root of 30221440 is about 311.4858945147.

Adding to 30221440 its reverse (4412203), we get a palindrome (34633643).

The spelling of 30221440 in words is "thirty million, two hundred twenty-one thousand, four hundred forty".