10012021021 has 32 divisors (see below), whose sum is σ = 10975240800. Its totient is φ = 9097420800.

The previous prime is 10012021013. The next prime is 10012021027. The reversal of 10012021021 is 12012021001.

It can be written as a sum of positive squares in 16 ways, for example, as 204089796 + 9807931225 = 14286^2 + 99035^2 .

It is not a de Polignac number, because 10012021021 - 2³ = 10012021013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10012020989 and 10012021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10012021027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24479065 + ... + 24479473.

It is an arithmetic number, because the mean of its divisors is an integer number (342976275).

Almost surely, 2^10012021021 is an apocalyptic number.

It is an amenable number.

10012021021 is a deficient number, since it is larger than the sum of its proper divisors (963219779).

10012021021 is a wasteful number, since it uses less digits than its factorization.

10012021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 10012021021 its reverse (12012021001), we get a palindrome (22024042022).

The spelling of 10012021021 in words is "ten billion, twelve million, twenty-one thousand, twenty-one".