30121345 has 8 divisors (see below), whose sum is σ = 36176040. Its totient is φ = 24076800.

The previous prime is 30121321. The next prime is 30121349. The reversal of 30121345 is 54312103.

It can be written as a sum of positive squares in 4 ways, for example, as 1893376 + 28227969 = 1376^2 + 5313^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-30121345 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30121349) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7921 + ... + 11089.

It is an arithmetic number, because the mean of its divisors is an integer number (4522005).

Almost surely, 2^30121345 is an apocalyptic number.

30121345 is the 3169-th octagonal number.

It is an amenable number.

30121345 is a deficient number, since it is larger than the sum of its proper divisors (6054695).

30121345 is a wasteful number, since it uses less digits than its factorization.

30121345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 30121345 is about 5488.2916285489. The cubic root of 30121345 is about 311.1416282659.

Adding to 30121345 its reverse (54312103), we get a palindrome (84433448).

The spelling of 30121345 in words is "thirty million, one hundred twenty-one thousand, three hundred forty-five".