12021343021 has 4 divisors (see below), whose sum is σ = 12173512000. Its totient is φ = 11869174044.

The previous prime is 12021343013. The next prime is 12021343027. The reversal of 12021343021 is 12034312021.

It is a happy number.

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: 12034312021 = 89 ⋅135216989.

It is a cyclic number.

It is not a de Polignac number, because 12021343021 - 2³ = 12021343013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021343021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021343027) 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, 76084371 + ... + 76084528.

It is an arithmetic number, because the mean of its divisors is an integer number (3043378000).

Almost surely, 2^12021343021 is an apocalyptic number.

It is an amenable number.

12021343021 is a deficient number, since it is larger than the sum of its proper divisors (152168979).

12021343021 is an equidigital number, since it uses as much as digits as its factorization.

12021343021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152168978.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12021343021 its reverse (12034312021), we get a palindrome (24055655042).

The spelling of 12021343021 in words is "twelve billion, twenty-one million, three hundred forty-three thousand, twenty-one".