10000100021 has 4 divisors (see below), whose sum is σ = 10017862752. Its totient is φ = 9982337292.

The previous prime is 10000100003. The next prime is 10000100023. The reversal of 10000100021 is 12000100001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10000100021 - 2³⁰ = 8926358197 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 = 10000099978 and 10000100014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000100023) 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, 8880521 + ... + 8881646.

It is an arithmetic number, because the mean of its divisors is an integer number (2504465688).

Almost surely, 2^10000100021 is an apocalyptic number.

It is an amenable number.

10000100021 is a deficient number, since it is larger than the sum of its proper divisors (17762731).

10000100021 is an equidigital number, since it uses as much as digits as its factorization.

10000100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17762730.

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

Adding to 10000100021 its reverse (12000100001), we get a palindrome (22000200022).

The spelling of 10000100021 in words is "ten billion, one hundred thousand, twenty-one".