30372021 has 24 divisors (see below), whose sum is σ = 45818136. Its totient is φ = 19368960.

The previous prime is 30372007. The next prime is 30372071. The reversal of 30372021 is 12027303.

It can be written as a sum of positive squares in 4 ways, for example, as 900 + 30371121 = 30^2 + 5511^2 .

It is not a de Polignac number, because 30372021 - 2⁷ = 30371893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30371985 and 30372003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30372071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18781 + ... + 20333.

It is an arithmetic number, because the mean of its divisors is an integer number (1909089).

Almost surely, 2^30372021 is an apocalyptic number.

It is an amenable number.

30372021 is a deficient number, since it is larger than the sum of its proper divisors (15446115).

30372021 is a wasteful number, since it uses less digits than its factorization.

30372021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653 (or 1650 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 30372021 is about 5511.0816542672. The cubic root of 30372021 is about 312.0023730096.

Adding to 30372021 its reverse (12027303), we get a palindrome (42399324).

The spelling of 30372021 in words is "thirty million, three hundred seventy-two thousand, twenty-one".