11011121001 has 24 divisors (see below), whose sum is σ = 15961190336. Its totient is φ = 7314844320.

The previous prime is 11011120999. The next prime is 11011121003. The reversal of 11011121001 is 10012111011.

It is an interprime number because it is at equal distance from previous prime (11011120999) and next prime (11011121003).

It is not a de Polignac number, because 11011121001 - 2¹ = 11011120999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11011121003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3479646 + ... + 3482808.

Almost surely, 2^11011121001 is an apocalyptic number.

It is an amenable number.

11011121001 is a deficient number, since it is larger than the sum of its proper divisors (4950069335).

11011121001 is a wasteful number, since it uses less digits than its factorization.

11011121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4413 (or 4410 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 11011121001 its reverse (10012111011), we get a palindrome (21023232012).

The spelling of 11011121001 in words is "eleven billion, eleven million, one hundred twenty-one thousand, one".