30221472 has 24 divisors (see below), whose sum is σ = 79331616. Its totient is φ = 10073792.

The previous prime is 30221467. The next prime is 30221473. The reversal of 30221472 is 27412203.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (30221473) 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, 157308 + ... + 157499.

It is an arithmetic number, because the mean of its divisors is an integer number (3305484).

Almost surely, 2^30221472 is an apocalyptic number.

30221472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

30221472 is an abundant number, since it is smaller than the sum of its proper divisors (49110144).

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

30221472 is a wasteful number, since it uses less digits than its factorization.

30221472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314820 (or 314812 counting only the distinct ones).

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

The square root of 30221472 is about 5497.4059337109. The cubic root of 30221472 is about 311.4860044537.

Adding to 30221472 its reverse (27412203), we get a palindrome (57633675).

The spelling of 30221472 in words is "thirty million, two hundred twenty-one thousand, four hundred seventy-two".