11100121001 has 4 divisors (see below), whose sum is σ = 11100512592. Its totient is φ = 11099729412.

The previous prime is 11100120979. The next prime is 11100121009. The reversal of 11100121001 is 10012100111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11100121001 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 11100121001.

It is not an unprimeable number, because it can be changed into a prime (11100121009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149651 + ... + 211176.

It is an arithmetic number, because the mean of its divisors is an integer number (2775128148).

Almost surely, 2^11100121001 is an apocalyptic number.

It is an amenable number.

11100121001 is a deficient number, since it is larger than the sum of its proper divisors (391591).

11100121001 is an equidigital number, since it uses as much as digits as its factorization.

11100121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391590.

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

Adding to 11100121001 its reverse (10012100111), we get a palindrome (21112221112).

It can be divided in two parts, 11 and 100121001, that multiplied together give a palindrome (1101331011).

The spelling of 11100121001 in words is "eleven billion, one hundred million, one hundred twenty-one thousand, one".