30031021 has 2 divisors, whose sum is σ = 30031022. Its totient is φ = 30031020.

The previous prime is 30030991. The next prime is 30031049. The reversal of 30031021 is 12013003.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29484900 + 546121 = 5430^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 30031021 - 2¹³ = 30022829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30030989 and 30031007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30031321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15015510 + 15015511.

It is an arithmetic number, because the mean of its divisors is an integer number (15015511).

Almost surely, 2^30031021 is an apocalyptic number.

It is an amenable number.

30031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30031021 is an equidigital number, since it uses as much as digits as its factorization.

30031021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 30031021 is about 5480.0566602910. The cubic root of 30031021 is about 310.8303131013.

Adding to 30031021 its reverse (12013003), we get a palindrome (42044024).

The spelling of 30031021 in words is "thirty million, thirty-one thousand, twenty-one".