30231143521 has 4 divisors (see below), whose sum is σ = 31048201492. Its totient is φ = 29414085552.

The previous prime is 30231143519. The next prime is 30231143557. The reversal of 30231143521 is 12534113203.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12534113203 = 77239 ⋅162277.

It can be written as a sum of positive squares in 2 ways, for example, as 25720140625 + 4511002896 = 160375^2 + 67164^2 .

It is a cyclic number.

It is not a de Polignac number, because 30231143521 - 2¹ = 30231143519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30231143821) 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, 408528930 + ... + 408529003.

It is an arithmetic number, because the mean of its divisors is an integer number (7762050373).

Almost surely, 2^30231143521 is an apocalyptic number.

30231143521 is the 100385-th hex number.

It is an amenable number.

30231143521 is a deficient number, since it is larger than the sum of its proper divisors (817057971).

30231143521 is an equidigital number, since it uses as much as digits as its factorization.

30231143521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817057970.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 30231143521 its reverse (12534113203), we get a palindrome (42765256724).

The spelling of 30231143521 in words is "thirty billion, two hundred thirty-one million, one hundred forty-three thousand, five hundred twenty-one".