30121205 has 8 divisors (see below), whose sum is σ = 36175032. Its totient is φ = 24077248.

The previous prime is 30121163. The next prime is 30121207. The reversal of 30121205 is 50212103.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5340721 + 24780484 = 2311^2 + 4978^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30121205 - 2¹⁸ = 29859061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9839 + ... + 12531.

It is an arithmetic number, because the mean of its divisors is an integer number (4521879).

Almost surely, 2^30121205 is an apocalyptic number.

It is an amenable number.

30121205 is a deficient number, since it is larger than the sum of its proper divisors (6053827).

30121205 is a wasteful number, since it uses less digits than its factorization.

30121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4935.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 30121205 is about 5488.2788741098. The cubic root of 30121205 is about 311.1411462169.

Adding to 30121205 its reverse (50212103), we get a palindrome (80333308).

The spelling of 30121205 in words is "thirty million, one hundred twenty-one thousand, two hundred five".