30310421 has 2 divisors, whose sum is σ = 30310422. Its totient is φ = 30310420.

The previous prime is 30310409. The next prime is 30310429. The reversal of 30310421 is 12401303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25959025 + 4351396 = 5095^2 + 2086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30310421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30310396 and 30310405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30310429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15155210 + 15155211.

It is an arithmetic number, because the mean of its divisors is an integer number (15155211).

Almost surely, 2^30310421 is an apocalyptic number.

It is an amenable number.

30310421 is a deficient number, since it is larger than the sum of its proper divisors (1).

30310421 is an equidigital number, since it uses as much as digits as its factorization.

30310421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 30310421 is about 5505.4900780948. The cubic root of 30310421 is about 311.7912976662.

Adding to 30310421 its reverse (12401303), we get a palindrome (42711724).

The spelling of 30310421 in words is "thirty million, three hundred ten thousand, four hundred twenty-one".