1111121123220 has 72 divisors (see below), whose sum is σ = 3376452033864. Its totient is φ = 295766984448.

The previous prime is 1111121123213. The next prime is 1111121123221. The reversal of 1111121123220 is 223211211111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27465107076 + 1083656016144 = 165726^2 + 1040988^2 .

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 = 1111121123193 and 1111121123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111121123221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5440939 + ... + 5641458.

It is an arithmetic number, because the mean of its divisors is an integer number (46895167137).

Almost surely, 2^{1111121123220} is an apocalyptic number.

1111121123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111121123220 is an abundant number, since it is smaller than the sum of its proper divisors (2265330910644).

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

1111121123220 is a wasteful number, since it uses less digits than its factorization.

1111121123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11082969 (or 11082964 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1111121123220 its reverse (223211211111), we get a palindrome (1334332334331).

The spelling of 1111121123220 in words is "one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty".