10000021021 has 8 divisors (see below), whose sum is σ = 10131554304. Its totient is φ = 9869312880.

The previous prime is 10000021007. The next prime is 10000021039. The reversal of 10000021021 is 12012000001.

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 10000021021 - 2¹⁵ = 9999988253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10000020995 and 10000021013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000021051) 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, 181870 + ... + 230383.

It is an arithmetic number, because the mean of its divisors is an integer number (1266444288).

Almost surely, 2^10000021021 is an apocalyptic number.

It is an amenable number.

10000021021 is a deficient number, since it is larger than the sum of its proper divisors (131533283).

10000021021 is a wasteful number, since it uses less digits than its factorization.

10000021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412571.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 10000021021 its reverse (12012000001), we get a palindrome (22012021022).

The spelling of 10000021021 in words is "ten billion, twenty-one thousand, twenty-one".