30253021 has 2 divisors, whose sum is σ = 30253022. Its totient is φ = 30253020.

The previous prime is 30253019. The next prime is 30253031. The reversal of 30253021 is 12035203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 4901796 = 5035^2 + 2214^2 .

It is a cyclic number.

It is not a de Polignac number, because 30253021 - 2¹ = 30253019 is a prime.

Together with 30253019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 30252986 and 30253004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30253031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15126510 + 15126511.

It is an arithmetic number, because the mean of its divisors is an integer number (15126511).

Almost surely, 2^30253021 is an apocalyptic number.

It is an amenable number.

30253021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30253021 is an equidigital number, since it uses as much as digits as its factorization.

30253021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 30253021 is about 5500.2746295071. The cubic root of 30253021 is about 311.5943562723.

Adding to 30253021 its reverse (12035203), we get a palindrome (42288224).

The spelling of 30253021 in words is "thirty million, two hundred fifty-three thousand, twenty-one".