11121121001 has 4 divisors (see below), whose sum is σ = 11132014404. Its totient is φ = 11110227600.

The previous prime is 11121120991. The next prime is 11121121007. The reversal of 11121121001 is 10012112111.

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 8603490025 + 2517630976 = 92755^2 + 50176^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121121001 - 2⁶ = 11121120937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121121007) 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, 5445170 + ... + 5447211.

It is an arithmetic number, because the mean of its divisors is an integer number (2783003601).

Almost surely, 2^11121121001 is an apocalyptic number.

It is an amenable number.

11121121001 is a deficient number, since it is larger than the sum of its proper divisors (10893403).

11121121001 is a wasteful number, since it uses less digits than its factorization.

11121121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10893402.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11121121001 its reverse (10012112111), we get a palindrome (21133233112).

The spelling of 11121121001 in words is "eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, one".