11221221001 has 16 divisors (see below), whose sum is σ = 12452290560. Its totient is φ = 10068794640.

The previous prime is 11221220999. The next prime is 11221221013. The reversal of 11221221001 is 10012212211.

It is not a de Polignac number, because 11221221001 - 2¹ = 11221220999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221221031) 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, 174991 + ... + 230356.

It is an arithmetic number, because the mean of its divisors is an integer number (778268160).

Almost surely, 2^11221221001 is an apocalyptic number.

It is an amenable number.

11221221001 is a deficient number, since it is larger than the sum of its proper divisors (1231069559).

11221221001 is a wasteful number, since it uses less digits than its factorization.

11221221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405444.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11221221001 its reverse (10012212211), we get a palindrome (21233433212).

The spelling of 11221221001 in words is "eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, one".