30127021 has 2 divisors, whose sum is σ = 30127022. Its totient is φ = 30127020.

The previous prime is 30127007. The next prime is 30127037. The reversal of 30127021 is 12072103.

It is a happy number.

It is an a-pointer prime, because the next prime (30127037) can be obtained adding 30127021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27185796 + 2941225 = 5214^2 + 1715^2 .

It is a cyclic number.

It is not a de Polignac number, because 30127021 - 2⁷ = 30126893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30126986 and 30127004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30127001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15063510 + 15063511.

It is an arithmetic number, because the mean of its divisors is an integer number (15063511).

Almost surely, 2^30127021 is an apocalyptic number.

It is an amenable number.

30127021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30127021 is an equidigital number, since it uses as much as digits as its factorization.

30127021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 30127021 is about 5488.8087049924. The cubic root of 30127021 is about 311.1611706531.

Adding to 30127021 its reverse (12072103), we get a palindrome (42199124).

The spelling of 30127021 in words is "thirty million, one hundred twenty-seven thousand, twenty-one".