11157121001 has 8 divisors (see below), whose sum is σ = 12242066760. Its totient is φ = 10104561792.

The previous prime is 11157120983. The next prime is 11157121021. The reversal of 11157121001 is 10012175111.

It can be written as a sum of positive squares in 4 ways, for example, as 1094021776 + 10063099225 = 33076^2 + 100315^2 .

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

It is not a de Polignac number, because 11157121001 - 2³⁰ = 10083379177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11157121021) 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, 8095916 + ... + 8097293.

It is an arithmetic number, because the mean of its divisors is an integer number (1530258345).

Almost surely, 2^11157121001 is an apocalyptic number.

It is an amenable number.

11157121001 is a deficient number, since it is larger than the sum of its proper divisors (1084945759).

11157121001 is a wasteful number, since it uses less digits than its factorization.

11157121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16193275.

The product of its (nonzero) digits is 70, while the sum is 20.

Adding to 11157121001 its reverse (10012175111), we get a palindrome (21169296112).

The spelling of 11157121001 in words is "eleven billion, one hundred fifty-seven million, one hundred twenty-one thousand, one".