11111212001 has 4 divisors (see below), whose sum is σ = 11112051504. Its totient is φ = 11110372500.

The previous prime is 11111211973. The next prime is 11111212009. The reversal of 11111212001 is 10021211111.

11111212001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 11111212001 - 2¹⁰ = 11111210977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111212009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399575 + ... + 426476.

It is an arithmetic number, because the mean of its divisors is an integer number (2778012876).

Almost surely, 2^11111212001 is an apocalyptic number.

It is an amenable number.

11111212001 is a deficient number, since it is larger than the sum of its proper divisors (839503).

11111212001 is an equidigital number, since it uses as much as digits as its factorization.

11111212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839502.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11111212001 its reverse (10021211111), we get a palindrome (21132423112).

The spelling of 11111212001 in words is "eleven billion, one hundred eleven million, two hundred twelve thousand, one".