11211111110001 has 16 divisors (see below), whose sum is σ = 16747802347968. Its totient is φ = 6610974609600.

The previous prime is 11211111109969. The next prime is 11211111110009. The reversal of 11211111110001 is 10001111111211.

It is not a de Polignac number, because 11211111110001 - 2⁵ = 11211111109969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11211111110009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4590953370 + ... + 4590955811.

It is an arithmetic number, because the mean of its divisors is an integer number (1046737646748).

Almost surely, 2^{11211111110001} is an apocalyptic number.

11211111110001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211111110001 is a deficient number, since it is larger than the sum of its proper divisors (5536691237967).

11211111110001 is a wasteful number, since it uses less digits than its factorization.

11211111110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9181909232.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 11211111110001 its reverse (10001111111211), we get a palindrome (21212222221212).

The spelling of 11211111110001 in words is "eleven trillion, two hundred eleven billion, one hundred eleven million, one hundred ten thousand, one".