30040021 has 4 divisors (see below), whose sum is σ = 32770944. Its totient is φ = 27309100.

The previous prime is 30040013. The next prime is 30040057. The reversal of 30040021 is 12004003.

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: 12004003 = 11 ⋅1091273.

It is a cyclic number.

It is not a de Polignac number, because 30040021 - 2³ = 30040013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30040721) 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, 1365445 + ... + 1365466.

It is an arithmetic number, because the mean of its divisors is an integer number (8192736).

Almost surely, 2^30040021 is an apocalyptic number.

It is an amenable number.

30040021 is a deficient number, since it is larger than the sum of its proper divisors (2730923).

30040021 is a wasteful number, since it uses less digits than its factorization.

30040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730922.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 30040021 is about 5480.8777581698. The cubic root of 30040021 is about 310.8613609236.

Adding to 30040021 its reverse (12004003), we get a palindrome (42044024).

It can be divided in two parts, 3004002 and 1, that added together give a palindrome (3004003).

The spelling of 30040021 in words is "thirty million, forty thousand, twenty-one".