12020324521 has 32 divisors (see below), whose sum is σ = 14027126400. Its totient is φ = 10222894080.

The previous prime is 12020324509. The next prime is 12020324627. The reversal of 12020324521 is 12542302021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12020324521 - 2¹¹ = 12020322473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020324492 and 12020324501.

It is not an unprimeable number, because it can be changed into a prime (12020324501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 769731 + ... + 785191.

It is an arithmetic number, because the mean of its divisors is an integer number (438347700).

Almost surely, 2^12020324521 is an apocalyptic number.

It is an amenable number.

12020324521 is a deficient number, since it is larger than the sum of its proper divisors (2006801879).

12020324521 is a wasteful number, since it uses less digits than its factorization.

12020324521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15609.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 12020324521 its reverse (12542302021), we get a palindrome (24562626542).

The spelling of 12020324521 in words is "twelve billion, twenty million, three hundred twenty-four thousand, five hundred twenty-one".