30404021 has 2 divisors, whose sum is σ = 30404022. Its totient is φ = 30404020.

The previous prime is 30403991. The next prime is 30404029. The reversal of 30404021 is 12040403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23571025 + 6832996 = 4855^2 + 2614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30404021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30403987 and 30404005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30404029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15202010 + 15202011.

It is an arithmetic number, because the mean of its divisors is an integer number (15202011).

Almost surely, 2^30404021 is an apocalyptic number.

It is an amenable number.

30404021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30404021 is an equidigital number, since it uses as much as digits as its factorization.

30404021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 30404021 is about 5513.9841312793. The cubic root of 30404021 is about 312.1119099150. Note that the first 3 decimals are identical.

Adding to 30404021 its reverse (12040403), we get a palindrome (42444424).

It can be divided in two parts, 3040402 and 1, that added together give a palindrome (3040403).

The spelling of 30404021 in words is "thirty million, four hundred four thousand, twenty-one".