30109021 has 4 divisors (see below), whose sum is σ = 30159232. Its totient is φ = 30058812.

The previous prime is 30109019. The next prime is 30109031. The reversal of 30109021 is 12090103.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12090103 = 59 ⋅204917.

It is a cyclic number.

It is not a de Polignac number, because 30109021 - 2¹ = 30109019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30108986 and 30109004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30109031) 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, 24195 + ... + 25408.

It is an arithmetic number, because the mean of its divisors is an integer number (7539808).

Almost surely, 2^30109021 is an apocalyptic number.

It is an amenable number.

30109021 is a deficient number, since it is larger than the sum of its proper divisors (50211).

30109021 is an equidigital number, since it uses as much as digits as its factorization.

30109021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50210.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 30109021 is about 5487.1687599344. The cubic root of 30109021 is about 311.0991884556.

Adding to 30109021 its reverse (12090103), we get a palindrome (42199124).

The spelling of 30109021 in words is "thirty million, one hundred nine thousand, twenty-one".