121110111221220 has 96 divisors (see below), whose sum is σ = 411040377498240. Its totient is φ = 29360026961280.

The previous prime is 121110111221201. The next prime is 121110111221249. The reversal of 121110111221220 is 22122111011121.

It is a happy number.

121110111221220 is a `hidden beast` number, since 1 + 2 + 1 + 110 + 111 + 221 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121110111221193 and 121110111221202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10194447867 + ... + 10194459746.

It is an arithmetic number, because the mean of its divisors is an integer number (4281670598940).

Almost surely, 2^{121110111221220} is an apocalyptic number.

121110111221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121110111221220 is an abundant number, since it is smaller than the sum of its proper divisors (289930266277020).

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

121110111221220 is a wasteful number, since it uses less digits than its factorization.

121110111221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20388907642 (or 20388907634 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121110111221220 its reverse (22122111011121), we get a palindrome (143232222232341).

The spelling of 121110111221220 in words is "one hundred twenty-one trillion, one hundred ten billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty".