30121256 has 72 divisors (see below), whose sum is σ = 66030510. Its totient is φ = 12862080.

The previous prime is 30121241. The next prime is 30121261. The reversal of 30121256 is 65212103.

It can be written as a sum of positive squares in 3 ways, for example, as 29528356 + 592900 = 5434^2 + 770^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 814070 + ... + 814106.

Almost surely, 2^30121256 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 30121256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33015255).

30121256 is an abundant number, since it is smaller than the sum of its proper divisors (35909254).

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

30121256 is a wasteful number, since it uses less digits than its factorization.

30121256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 30121256 is about 5488.2835203732. The cubic root of 30121256 is about 311.1413218206.

Adding to 30121256 its reverse (65212103), we get a palindrome (95333359).

The spelling of 30121256 in words is "thirty million, one hundred twenty-one thousand, two hundred fifty-six".