30403430021 has 4 divisors (see below), whose sum is σ = 30403821600. Its totient is φ = 30403038444.

The previous prime is 30403429999. The next prime is 30403430081. The reversal of 30403430021 is 12003430403.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 30403430021 - 2¹⁸ = 30403167877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30403429975 and 30403430002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30403430081) 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, 35681 + ... + 249158.

It is an arithmetic number, because the mean of its divisors is an integer number (7600955400).

Almost surely, 2^30403430021 is an apocalyptic number.

It is an amenable number.

30403430021 is a deficient number, since it is larger than the sum of its proper divisors (391579).

30403430021 is a wasteful number, since it uses less digits than its factorization.

30403430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391578.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 30403430021 its reverse (12003430403), we get a palindrome (42406860424).

The spelling of 30403430021 in words is "thirty billion, four hundred three million, four hundred thirty thousand, twenty-one".