10000010021 has 4 divisors (see below), whose sum is σ = 10000308972. Its totient is φ = 9999711072.

The previous prime is 10000009997. The next prime is 10000010071. The reversal of 10000010021 is 12001000001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 364428100 + 9635581921 = 19090^2 + 98161^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000010021 - 2¹⁴ = 9999993637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10000009987 and 10000010014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000010071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91910 + ... + 168663.

It is an arithmetic number, because the mean of its divisors is an integer number (2500077243).

Almost surely, 2^10000010021 is an apocalyptic number.

It is an amenable number.

10000010021 is a deficient number, since it is larger than the sum of its proper divisors (298951).

10000010021 is an equidigital number, since it uses as much as digits as its factorization.

10000010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298950.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 10000010021 its reverse (12001000001), we get a palindrome (22001010022).

The spelling of 10000010021 in words is "ten billion, ten thousand, twenty-one".