12201121021111 has 128 divisors (see below), whose sum is σ = 15064438579200. Its totient is φ = 9750713955840.

The previous prime is 12201121021093. The next prime is 12201121021121. The reversal of 12201121021111 is 11112012110221.

It is not a de Polignac number, because 12201121021111 - 2⁵ = 12201121021079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201121021121) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9509836476 + ... + 9509837758.

It is an arithmetic number, because the mean of its divisors is an integer number (117690926400).

Almost surely, 2^{12201121021111} is an apocalyptic number.

12201121021111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12201121021111 is a deficient number, since it is larger than the sum of its proper divisors (2863317558089).

12201121021111 is a wasteful number, since it uses less digits than its factorization.

12201121021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781.

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

Adding to 12201121021111 its reverse (11112012110221), we get a palindrome (23313133131332).

The spelling of 12201121021111 in words is "twelve trillion, two hundred one billion, one hundred twenty-one million, twenty-one thousand, one hundred eleven".