11121001001 has 8 divisors (see below), whose sum is σ = 12132988608. Its totient is φ = 10109178000.

The previous prime is 11121000991. The next prime is 11121001019. The reversal of 11121001001 is 10010012111.

It is a happy number.

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 11121001001 - 2⁶ = 11121000937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11121001001.

It is not an unprimeable number, because it can be changed into a prime (11121001051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131711 + ... + 198971.

It is an arithmetic number, because the mean of its divisors is an integer number (1516623576).

Almost surely, 2^11121001001 is an apocalyptic number.

11121001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11121001001 is a deficient number, since it is larger than the sum of its proper divisors (1011987607).

11121001001 is a wasteful number, since it uses less digits than its factorization.

11121001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82303.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 11121001001 its reverse (10010012111), we get a palindrome (21131013112).

The spelling of 11121001001 in words is "eleven billion, one hundred twenty-one million, one thousand, one".