30020021 has 4 divisors (see below), whose sum is σ = 30381792. Its totient is φ = 29658252.

The previous prime is 30019963. The next prime is 30020041. The reversal of 30020021 is 12002003.

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 30020021 - 2¹⁰ = 30018997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30019990 and 30020008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30020041) 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, 180761 + ... + 180926.

It is an arithmetic number, because the mean of its divisors is an integer number (7595448).

Almost surely, 2^30020021 is an apocalyptic number.

It is an amenable number.

30020021 is a deficient number, since it is larger than the sum of its proper divisors (361771).

30020021 is an equidigital number, since it uses as much as digits as its factorization.

30020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361770.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 30020021 is about 5479.0529291110. The cubic root of 30020021 is about 310.7923573378.

Adding to 30020021 its reverse (12002003), we get a palindrome (42022024).

It can be divided in two parts, 3002002 and 1, that added together give a palindrome (3002003).

The spelling of 30020021 in words is "thirty million, twenty thousand, twenty-one".