11001220021 has 8 divisors (see below), whose sum is σ = 12004308000. Its totient is φ = 9998628240.

The previous prime is 11001220019. The next prime is 11001220033. The reversal of 11001220021 is 12002210011.

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

It is a cyclic number.

It is not a de Polignac number, because 11001220021 - 2¹ = 11001220019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001220721) 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, 76906 + ... + 167083.

It is an arithmetic number, because the mean of its divisors is an integer number (1500538500).

Almost surely, 2^11001220021 is an apocalyptic number.

11001220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001220021 is a deficient number, since it is larger than the sum of its proper divisors (1003087979).

11001220021 is a wasteful number, since it uses less digits than its factorization.

11001220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248099.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 11001220021 its reverse (12002210011), we get a palindrome (23003430032).

The spelling of 11001220021 in words is "eleven billion, one million, two hundred twenty thousand, twenty-one".