1101121111021 has 8 divisors (see below), whose sum is σ = 1101838831544. Its totient is φ = 1100403532800.

The previous prime is 1101121111001. The next prime is 1101121111159. The reversal of 1101121111021 is 1201111211011.

It can be written as a sum of positive squares in 4 ways, for example, as 369901158025 + 731219952996 = 608195^2 + 855114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1101121111021 - 2⁷ = 1101121110893 is a prime.

It is a super-2 number, since 2×1101121111021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101121110992 and 1101121111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101121111001) 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 7 ways as a sum of consecutive naturals, for example, 18514885 + ... + 18574261.

It is an arithmetic number, because the mean of its divisors is an integer number (137729853943).

Almost surely, 2^{1101121111021} is an apocalyptic number.

It is an amenable number.

1101121111021 is a deficient number, since it is larger than the sum of its proper divisors (717720523).

1101121111021 is an equidigital number, since it uses as much as digits as its factorization.

1101121111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71151.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1101121111021 its reverse (1201111211011), we get a palindrome (2302232322032).

The spelling of 1101121111021 in words is "one trillion, one hundred one billion, one hundred twenty-one million, one hundred eleven thousand, twenty-one".