11001000221001 has 96 divisors (see below), whose sum is σ = 19207170318336. Its totient is φ = 5933966688000.

The previous prime is 11001000220993. The next prime is 11001000221021. The reversal of 11001000221001 is 10012200010011.

It is a happy number.

It is not a de Polignac number, because 11001000221001 - 2³ = 11001000220993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (11001000221021) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 553054266 + ... + 553074156.

It is an arithmetic number, because the mean of its divisors is an integer number (200074690816).

Almost surely, 2^{11001000221001} is an apocalyptic number.

It is an amenable number.

11001000221001 is a deficient number, since it is larger than the sum of its proper divisors (8206170097335).

11001000221001 is a wasteful number, since it uses less digits than its factorization.

11001000221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26883 (or 26880 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11001000221001 its reverse (10012200010011), we get a palindrome (21013200231012).

The spelling of 11001000221001 in words is "eleven trillion, one billion, two hundred twenty-one thousand, one".