12021001221111 has 16 divisors (see below), whose sum is σ = 16084961846400. Its totient is φ = 7985521847520.

The previous prime is 12021001221107. The next prime is 12021001221169. The reversal of 12021001221111 is 11112210012021.

It is a happy number.

It is not a de Polignac number, because 12021001221111 - 2² = 12021001221107 is a prime.

It is a super-2 number, since 2×12021001221111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021001221611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54181996 + ... + 54403406.

It is an arithmetic number, because the mean of its divisors is an integer number (1005310115400).

Almost surely, 2^{12021001221111} is an apocalyptic number.

12021001221111 is a deficient number, since it is larger than the sum of its proper divisors (4063960625289).

12021001221111 is a wasteful number, since it uses less digits than its factorization.

12021001221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285646.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12021001221111 its reverse (11112210012021), we get a palindrome (23133211233132).

The spelling of 12021001221111 in words is "twelve trillion, twenty-one billion, one million, two hundred twenty-one thousand, one hundred eleven".