12011101221 has 16 divisors (see below), whose sum is σ = 18304206464. Its totient is φ = 6862895424.

The previous prime is 12011101217. The next prime is 12011101231. The reversal of 12011101221 is 12210111021.

It is not a de Polignac number, because 12011101221 - 2² = 12011101217 is a prime.

It is a super-2 number, since 2×12011101221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011101197 and 12011101206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011101231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378651 + ... + 409143.

It is an arithmetic number, because the mean of its divisors is an integer number (1144012904).

Almost surely, 2^12011101221 is an apocalyptic number.

It is an amenable number.

12011101221 is a deficient number, since it is larger than the sum of its proper divisors (6293105243).

12011101221 is a wasteful number, since it uses less digits than its factorization.

12011101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49260.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12011101221 its reverse (12210111021), we get a palindrome (24221212242).

The spelling of 12011101221 in words is "twelve billion, eleven million, one hundred one thousand, two hundred twenty-one".