12021311011 has 4 divisors (see below), whose sum is σ = 12021938632. Its totient is φ = 12020683392.

The previous prime is 12021310993. The next prime is 12021311021. The reversal of 12021311011 is 11011312021.

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: 11011312021 = 1697 ⋅6488693.

It is a cyclic number.

It is not a de Polignac number, because 12021311011 - 2¹¹ = 12021308963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021310982 and 12021311000.

It is not an unprimeable number, because it can be changed into a prime (12021311021) 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, 284145 + ... + 323698.

It is an arithmetic number, because the mean of its divisors is an integer number (3005484658).

Almost surely, 2^12021311011 is an apocalyptic number.

12021311011 is a deficient number, since it is larger than the sum of its proper divisors (627621).

12021311011 is an equidigital number, since it uses as much as digits as its factorization.

12021311011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627620.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 12021311011 its reverse (11011312021), we get a palindrome (23032623032).

The spelling of 12021311011 in words is "twelve billion, twenty-one million, three hundred eleven thousand, eleven".