30005421 has 4 divisors (see below), whose sum is σ = 40007232. Its totient is φ = 20003612.

The previous prime is 30005387. The next prime is 30005429. The reversal of 30005421 is 12450003.

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 30005421 - 2¹⁸ = 29743277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30005421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30005429) 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, 5000901 + ... + 5000906.

It is an arithmetic number, because the mean of its divisors is an integer number (10001808).

Almost surely, 2^30005421 is an apocalyptic number.

It is an amenable number.

30005421 is a deficient number, since it is larger than the sum of its proper divisors (10001811).

30005421 is a wasteful number, since it uses less digits than its factorization.

30005421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10001810.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 30005421 is about 5477.7204200288. The cubic root of 30005421 is about 310.7419653653.

Adding to 30005421 its reverse (12450003), we get a palindrome (42455424).

The spelling of 30005421 in words is "thirty million, five thousand, four hundred twenty-one".