10001001021 has 24 divisors (see below), whose sum is σ = 14667750720. Its totient is φ = 6056814720.

The previous prime is 10001001011. The next prime is 10001001037. The reversal of 10001001021 is 12010010001.

It is not a de Polignac number, because 10001001021 - 2¹⁰ = 10000999997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001001001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 531256 + ... + 549758.

It is an arithmetic number, because the mean of its divisors is an integer number (611156280).

Almost surely, 2^10001001021 is an apocalyptic number.

10001001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10001001021 is a deficient number, since it is larger than the sum of its proper divisors (4666749699).

10001001021 is a wasteful number, since it uses less digits than its factorization.

10001001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20017 (or 20006 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 10001001021 its reverse (12010010001), we get a palindrome (22011011022).

The spelling of 10001001021 in words is "ten billion, one million, one thousand, twenty-one".