111201122121220 has 12 divisors (see below), whose sum is σ = 233522356454604. Its totient is φ = 44480448848480.

The previous prime is 111201122121209. The next prime is 111201122121247. The reversal of 111201122121220 is 22121221102111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78042665598976 + 33158456522244 = 8834176^2 + 5758338^2 .

It is a super-2 number, since 2×111201122121220² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2780028053011 + ... + 2780028053050.

It is an arithmetic number, because the mean of its divisors is an integer number (19460196371217).

Almost surely, 2^{111201122121220} is an apocalyptic number.

111201122121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111201122121220 is an abundant number, since it is smaller than the sum of its proper divisors (122321234333384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111201122121220 is a wasteful number, since it uses less digits than its factorization.

111201122121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560056106070 (or 5560056106068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111201122121220 its reverse (22121221102111), we get a palindrome (133322343223331).

The spelling of 111201122121220 in words is "one hundred eleven trillion, two hundred one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".