11100121001001 has 12 divisors (see below), whose sum is σ = 16424569286580. Its totient is φ = 7219590894720.

The previous prime is 11100121000939. The next prime is 11100121001027. The reversal of 11100121001001 is 10010012100111.

It can be written as a sum of positive squares in 2 ways, for example, as 3052550594025 + 8047570406976 = 1747155^2 + 2836824^2 .

It is not a de Polignac number, because 11100121001001 - 2⁴³ = 2304027978793 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (11100121001051) 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 11 ways as a sum of consecutive naturals, for example, 15040813996 + ... + 15040814733.

It is an arithmetic number, because the mean of its divisors is an integer number (1368714107215).

Almost surely, 2^{11100121001001} is an apocalyptic number.

It is an amenable number.

11100121001001 is a deficient number, since it is larger than the sum of its proper divisors (5324448285579).

11100121001001 is a wasteful number, since it uses less digits than its factorization.

11100121001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30081628776 (or 30081628773 counting only the distinct ones).

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

Adding to 11100121001001 its reverse (10010012100111), we get a palindrome (21110133101112).

The spelling of 11100121001001 in words is "eleven trillion, one hundred billion, one hundred twenty-one million, one thousand, one".