11111002001 has 32 divisors (see below), whose sum is σ = 13533091200. Its totient is φ = 8990714880.

The previous prime is 11111001977. The next prime is 11111002003. The reversal of 11111002001 is 10020011111.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-11111002001 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 11111002001.

It is not an unprimeable number, because it can be changed into a prime (11111002003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2317715 + ... + 2322503.

It is an arithmetic number, because the mean of its divisors is an integer number (422909100).

Almost surely, 2^11111002001 is an apocalyptic number.

11111002001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111002001 is a deficient number, since it is larger than the sum of its proper divisors (2422089199).

11111002001 is a wasteful number, since it uses less digits than its factorization.

11111002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489.

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

Adding to 11111002001 its reverse (10020011111), we get a palindrome (21131013112).

It can be divided in two parts, 1111 and 1002001, that multiplied together give a palindrome (1113223111).

The spelling of 11111002001 in words is "eleven billion, one hundred eleven million, two thousand, one".