30221256 has 48 divisors (see below), whose sum is σ = 81822960. Its totient is φ = 9297600.

The previous prime is 30221251. The next prime is 30221273. The reversal of 30221256 is 65212203.

It is not an unprimeable number, because it can be changed into a prime (30221251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (1704645).

Almost surely, 2^30221256 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 30221256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40911480).

30221256 is an abundant number, since it is smaller than the sum of its proper divisors (51601704).

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

30221256 is a wasteful number, since it uses less digits than its factorization.

30221256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486 (or 7469 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 30221256 is about 5497.3862880463. The cubic root of 30221256 is about 311.4852623639.

Adding to 30221256 its reverse (65212203), we get a palindrome (95433459).

It can be divided in two parts, 3022 and 1256, that added together give a triangular number (4278 = T₉₂).

The spelling of 30221256 in words is "thirty million, two hundred twenty-one thousand, two hundred fifty-six".