12021001011 has 12 divisors (see below), whose sum is σ = 17431234392. Its totient is φ = 7982816256.

The previous prime is 12021000973. The next prime is 12021001043. The reversal of 12021001011 is 11010012021.

It is a happy number.

12021001011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12021001011 - 2¹⁰ = 12020999987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12021000984 and 12021001002.

It is not an unprimeable number, because it can be changed into a prime (12021001211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2596261 + ... + 2600886.

It is an arithmetic number, because the mean of its divisors is an integer number (1452602866).

Almost surely, 2^12021001011 is an apocalyptic number.

12021001011 is a deficient number, since it is larger than the sum of its proper divisors (5410233381).

12021001011 is a wasteful number, since it uses less digits than its factorization.

12021001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5197410 (or 5197407 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12021001011 its reverse (11010012021), we get a palindrome (23031013032).

The spelling of 12021001011 in words is "twelve billion, twenty-one million, one thousand, eleven".