1101120121021 has 4 divisors (see below), whose sum is σ = 1101135004732. Its totient is φ = 1101105237312.

The previous prime is 1101120120977. The next prime is 1101120121067. The reversal of 1101120121021 is 1201210211011.

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 812873544025 + 288246576996 = 901595^2 + 536886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101120121021 - 2¹⁵ = 1101120088253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101120120992 and 1101120121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101120191021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7330326 + ... + 7479031.

It is an arithmetic number, because the mean of its divisors is an integer number (275283751183).

Almost surely, 2^{1101120121021} is an apocalyptic number.

It is an amenable number.

1101120121021 is a deficient number, since it is larger than the sum of its proper divisors (14883711).

1101120121021 is an equidigital number, since it uses as much as digits as its factorization.

1101120121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14883710.

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

Adding to 1101120121021 its reverse (1201210211011), we get a palindrome (2302330332032).

The spelling of 1101120121021 in words is "one trillion, one hundred one billion, one hundred twenty million, one hundred twenty-one thousand, twenty-one".