1121212121101 has 4 divisors (see below), whose sum is σ = 1121706267100. Its totient is φ = 1120717975104.

The previous prime is 1121212121041. The next prime is 1121212121143. The reversal of 1121212121101 is 1011212121211.

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 54589986025 + 1066622135076 = 233645^2 + 1032774^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121212121101 - 2³³ = 1112622186509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121212121191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247069596 + ... + 247074133.

It is an arithmetic number, because the mean of its divisors is an integer number (280426566775).

Almost surely, 2^{1121212121101} is an apocalyptic number.

It is an amenable number.

1121212121101 is a deficient number, since it is larger than the sum of its proper divisors (494145999).

1121212121101 is an equidigital number, since it uses as much as digits as its factorization.

1121212121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494145998.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1121212121101 its reverse (1011212121211), we get a palindrome (2132424242312).

The spelling of 1121212121101 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred one".