12021230311 has 4 divisors (see below), whose sum is σ = 12033925272. Its totient is φ = 12008535352.

The previous prime is 12021230303. The next prime is 12021230317. The reversal of 12021230311 is 11303212021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11303212021 = 1423 ⋅7943227.

It is a cyclic number.

It is not a de Polignac number, because 12021230311 - 2³ = 12021230303 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 (12021230317) 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, 6346060 + ... + 6347953.

It is an arithmetic number, because the mean of its divisors is an integer number (3008481318).

Almost surely, 2^12021230311 is an apocalyptic number.

12021230311 is a deficient number, since it is larger than the sum of its proper divisors (12694961).

12021230311 is an equidigital number, since it uses as much as digits as its factorization.

12021230311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12694960.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12021230311 its reverse (11303212021), we get a palindrome (23324442332).

The spelling of 12021230311 in words is "twelve billion, twenty-one million, two hundred thirty thousand, three hundred eleven".