30021121 has 12 divisors (see below), whose sum is σ = 34126932. Its totient is φ = 26249184.

The previous prime is 30021091. The next prime is 30021137. The reversal of 30021121 is 12112003.

It can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 28302400 = 1311^2 + 5320^2 .

It is a de Polignac number, because none of the positive numbers 2^k-30021121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30021098 and 30021107.

It is not an unprimeable number, because it can be changed into a prime (30021151) 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, 1495 + ... + 7891.

It is an arithmetic number, because the mean of its divisors is an integer number (2843911).

Almost surely, 2^30021121 is an apocalyptic number.

It is an amenable number.

30021121 is a deficient number, since it is larger than the sum of its proper divisors (4105811).

30021121 is a wasteful number, since it uses less digits than its factorization.

30021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6448 (or 6429 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 30021121 is about 5479.1533105034. The cubic root of 30021121 is about 310.7961533314.

Adding to 30021121 its reverse (12112003), we get a palindrome (42133124).

The spelling of 30021121 in words is "thirty million, twenty-one thousand, one hundred twenty-one".