1220100111121 has 4 divisors (see below), whose sum is σ = 1220107792932. Its totient is φ = 1220092429312.

The previous prime is 1220100111119. The next prime is 1220100111149. The reversal of 1220100111121 is 1211110010221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 229057960000 + 991042151121 = 478600^2 + 995511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220100111121 - 2¹ = 1220100111119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220100111161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3597520 + ... + 3922033.

It is an arithmetic number, because the mean of its divisors is an integer number (305026948233).

Almost surely, 2^{1220100111121} is an apocalyptic number.

It is an amenable number.

1220100111121 is a deficient number, since it is larger than the sum of its proper divisors (7681811).

1220100111121 is an equidigital number, since it uses as much as digits as its factorization.

1220100111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7681810.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1220100111121 its reverse (1211110010221), we get a palindrome (2431210121342).

The spelling of 1220100111121 in words is "one trillion, two hundred twenty billion, one hundred million, one hundred eleven thousand, one hundred twenty-one".