30851121 has 16 divisors (see below), whose sum is σ = 47151104. Its totient is φ = 17576784.

The previous prime is 30851113. The next prime is 30851123. The reversal of 30851121 is 12115803.

It is not a de Polignac number, because 30851121 - 2³ = 30851113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (30851123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5706 + ... + 9708.

It is an arithmetic number, because the mean of its divisors is an integer number (2946944).

Almost surely, 2^30851121 is an apocalyptic number.

It is an amenable number.

30851121 is a deficient number, since it is larger than the sum of its proper divisors (16299983).

30851121 is a wasteful number, since it uses less digits than its factorization.

30851121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 30851121 is about 5554.3785430955. The cubic root of 30851121 is about 313.6343702839.

Adding to 30851121 its reverse (12115803), we get a palindrome (42966924).

The spelling of 30851121 in words is "thirty million, eight hundred fifty-one thousand, one hundred twenty-one".