30442421 has 4 divisors (see below), whose sum is σ = 30561132. Its totient is φ = 30323712.

The previous prime is 30442411. The next prime is 30442429. The reversal of 30442421 is 12424403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12424403 = 47 ⋅264349.

It can be written as a sum of positive squares in 2 ways, for example, as 15888196 + 14554225 = 3986^2 + 3815^2 .

It is a cyclic number.

It is not a de Polignac number, because 30442421 - 2¹⁴ = 30426037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30442393 and 30442402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30442429) 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, 58970 + ... + 59483.

It is an arithmetic number, because the mean of its divisors is an integer number (7640283).

Almost surely, 2^30442421 is an apocalyptic number.

It is an amenable number.

30442421 is a deficient number, since it is larger than the sum of its proper divisors (118711).

30442421 is a wasteful number, since it uses less digits than its factorization.

30442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118710.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 30442421 is about 5517.4650882448. The cubic root of 30442421 is about 312.2432527966.

Adding to 30442421 its reverse (12424403), we get a palindrome (42866824).

The spelling of 30442421 in words is "thirty million, four hundred forty-two thousand, four hundred twenty-one".