30005021 has 4 divisors (see below), whose sum is σ = 30156000. Its totient is φ = 29854044.

The previous prime is 30005011. The next prime is 30005023. The reversal of 30005021 is 12050003.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30005021 - 2²² = 25810717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30004993 and 30005011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30005023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75191 + ... + 75588.

It is an arithmetic number, because the mean of its divisors is an integer number (7539000).

Almost surely, 2^30005021 is an apocalyptic number.

It is an amenable number.

30005021 is a deficient number, since it is larger than the sum of its proper divisors (150979).

30005021 is a wasteful number, since it uses less digits than its factorization.

30005021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150978.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 30005021 is about 5477.6839083686. The cubic root of 30005021 is about 310.7405845333.

Adding to 30005021 its reverse (12050003), we get a palindrome (42055024).

The spelling of 30005021 in words is "thirty million, five thousand, twenty-one".