30030021 has 20 divisors (see below), whose sum is σ = 51269152. Its totient is φ = 17159688.

The previous prime is 30029969. The next prime is 30030023. The reversal of 30030021 is 12003003.

It is a happy number.

It is not a de Polignac number, because 30030021 - 2⁷ = 30029893 is a prime.

It is a super-2 number, since 2×30030021² = 1803604322520882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30029985 and 30030012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30030023) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25915 + ... + 27048.

Almost surely, 2^30030021 is an apocalyptic number.

It is an amenable number.

30030021 is a deficient number, since it is larger than the sum of its proper divisors (21239131).

30030021 is an equidigital number, since it uses as much as digits as its factorization.

30030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52982 (or 52973 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 30030021 is about 5479.9654195989. The cubic root of 30030021 is about 310.8268629604.

Adding to 30030021 its reverse (12003003), we get a palindrome (42033024).

It can be divided in two parts, 3003002 and 1, that added together give a palindrome (3003003).

The spelling of 30030021 in words is "thirty million, thirty thousand, twenty-one".