12101011221 has 64 divisors (see below), whose sum is σ = 18421240320. Its totient is φ = 7013744640.

The previous prime is 12101011207. The next prime is 12101011243. The reversal of 12101011221 is 12211010121.

It is not a de Polignac number, because 12101011221 - 2¹⁰ = 12101010197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12101011197 and 12101011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101011261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8007856 + ... + 8009366.

It is an arithmetic number, because the mean of its divisors is an integer number (287831880).

Almost surely, 2^12101011221 is an apocalyptic number.

It is an amenable number.

12101011221 is a deficient number, since it is larger than the sum of its proper divisors (6320229099).

12101011221 is a wasteful number, since it uses less digits than its factorization.

12101011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726.

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

Adding to 12101011221 its reverse (12211010121), we get a palindrome (24312021342).

It can be divided in two parts, 121010 and 11221, that added together give a palindrome (132231).

The spelling of 12101011221 in words is "twelve billion, one hundred one million, eleven thousand, two hundred twenty-one".