10001111021 has 8 divisors (see below), whose sum is σ = 10988796000. Its totient is φ = 9026508240.

The previous prime is 10001110963. The next prime is 10001111023. The reversal of 10001111021 is 12011110001.

It is a happy number.

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 10001111021 - 2⁶ = 10001110957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3268946 + ... + 3272003.

It is an arithmetic number, because the mean of its divisors is an integer number (1373599500).

Almost surely, 2^10001111021 is an apocalyptic number.

10001111021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10001111021 is a deficient number, since it is larger than the sum of its proper divisors (987684979).

10001111021 is a wasteful number, since it uses less digits than its factorization.

10001111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6541099.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 10001111021 its reverse (12011110001), we get a palindrome (22012221022).

The spelling of 10001111021 in words is "ten billion, one million, one hundred eleven thousand, twenty-one".