30421021 has 2 divisors, whose sum is σ = 30421022. Its totient is φ = 30421020.

The previous prime is 30421009. The next prime is 30421031. The reversal of 30421021 is 12012403.

30421021 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19272100 + 11148921 = 4390^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 30421021 - 2⁵ = 30420989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30420992 and 30421010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30421031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15210510 + 15210511.

It is an arithmetic number, because the mean of its divisors is an integer number (15210511).

Almost surely, 2^30421021 is an apocalyptic number.

It is an amenable number.

30421021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30421021 is an equidigital number, since it uses as much as digits as its factorization.

30421021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 30421021 is about 5515.5254509430. The cubic root of 30421021 is about 312.1700701374.

Adding to 30421021 its reverse (12012403), we get a palindrome (42433424).

The spelling of 30421021 in words is "thirty million, four hundred twenty-one thousand, twenty-one".