11001221021 has 8 divisors (see below), whose sum is σ = 13006369920. Its totient is φ = 9104458608.

The previous prime is 11001221009. The next prime is 11001221039. The reversal of 11001221021 is 12012210011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11001221021 - 2¹⁸ = 11000958877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001220993 and 11001221011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001221071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27096401 + ... + 27096806.

It is an arithmetic number, because the mean of its divisors is an integer number (1625796240).

Almost surely, 2^11001221021 is an apocalyptic number.

It is an amenable number.

11001221021 is a deficient number, since it is larger than the sum of its proper divisors (2005148899).

11001221021 is an equidigital number, since it uses as much as digits as its factorization.

11001221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54193243.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11001221021 its reverse (12012210011), we get a palindrome (23013431032).

The spelling of 11001221021 in words is "eleven billion, one million, two hundred twenty-one thousand, twenty-one".