30205534021 has 4 divisors (see below), whose sum is σ = 32529036652. Its totient is φ = 27882031392.

The previous prime is 30205534013. The next prime is 30205534049. The reversal of 30205534021 is 12043550203.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12043550203 = 47 ⋅256245749.

It can be written as a sum of positive squares in 2 ways, for example, as 12493650625 + 17711883396 = 111775^2 + 133086^2 .

It is a cyclic number.

It is not a de Polignac number, because 30205534021 - 2³ = 30205534013 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 (30205534081) 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, 1161751296 + ... + 1161751321.

It is an arithmetic number, because the mean of its divisors is an integer number (8132259163).

Almost surely, 2^30205534021 is an apocalyptic number.

It is an amenable number.

30205534021 is a deficient number, since it is larger than the sum of its proper divisors (2323502631).

30205534021 is a wasteful number, since it uses less digits than its factorization.

30205534021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323502630.

The product of its (nonzero) digits is 3600, while the sum is 25.

The spelling of 30205534021 in words is "thirty billion, two hundred five million, five hundred thirty-four thousand, twenty-one".