11221001 has 16 divisors (see below), whose sum is σ = 13141440. Its totient is φ = 9472320.

The previous prime is 11220997. The next prime is 11221009. The reversal of 11221001 is 10012211.

It is not a de Polignac number, because 11221001 - 2² = 11220997 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 11221001.

It is not an unprimeable number, because it can be changed into a prime (11221009) 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, 10571 + ... + 11583.

It is an arithmetic number, because the mean of its divisors is an integer number (821340).

Almost surely, 2^11221001 is an apocalyptic number.

11221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11221001 is a deficient number, since it is larger than the sum of its proper divisors (1920439).

11221001 is a wasteful number, since it uses less digits than its factorization.

11221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 11221001 is about 3349.7762611852. The cubic root of 11221001 is about 223.8775438779.

Adding to 11221001 its reverse (10012211), we get a palindrome (21233212).

The spelling of 11221001 in words is "eleven million, two hundred twenty-one thousand, one".