30000203021 has 4 divisors (see below), whose sum is σ = 30291467232. Its totient is φ = 29708938812.

The previous prime is 30000202993. The next prime is 30000203047. The reversal of 30000203021 is 12030200003.

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: 12030200003 = 34273 ⋅351011.

It is a cyclic number.

It is not a de Polignac number, because 30000203021 - 2²⁶ = 29933094157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30000202993 and 30000203011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30200203021) 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, 145631951 + ... + 145632156.

It is an arithmetic number, because the mean of its divisors is an integer number (7572866808).

Almost surely, 2^30000203021 is an apocalyptic number.

It is an amenable number.

30000203021 is a deficient number, since it is larger than the sum of its proper divisors (291264211).

30000203021 is a wasteful number, since it uses less digits than its factorization.

30000203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291264210.

The product of its (nonzero) digits is 36, while the sum is 11.

Adding to 30000203021 its reverse (12030200003), we get a palindrome (42030403024).

The spelling of 30000203021 in words is "thirty billion, two hundred three thousand, twenty-one".