11211001001 has 4 divisors (see below), whose sum is σ = 11213865600. Its totient is φ = 11208136404.

The previous prime is 11211000973. The next prime is 11211001003. The reversal of 11211001001 is 10010011211.

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 not a de Polignac number, because 11211001001 - 2¹⁰ = 11210999977 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 11211001001.

It is not an unprimeable number, because it can be changed into a prime (11211001003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426421 + ... + 1434258.

It is an arithmetic number, because the mean of its divisors is an integer number (2803466400).

Almost surely, 2^11211001001 is an apocalyptic number.

It is an amenable number.

11211001001 is a deficient number, since it is larger than the sum of its proper divisors (2864599).

11211001001 is an equidigital number, since it uses as much as digits as its factorization.

11211001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864598.

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

Adding to 11211001001 its reverse (10010011211), we get a palindrome (21221012212).

The spelling of 11211001001 in words is "eleven billion, two hundred eleven million, one thousand, one".