10020012021 has 12 divisors (see below), whose sum is σ = 14622561772. Its totient is φ = 6611141376.

The previous prime is 10020012011. The next prime is 10020012061. The reversal of 10020012021 is 12021002001.

10020012021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7050960900 + 2969051121 = 83970^2 + 54489^2 .

It is not a de Polignac number, because 10020012021 - 2²¹ = 10017914869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10020011994 and 10020012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020012011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5737966 + ... + 5739711.

Almost surely, 2^10020012021 is an apocalyptic number.

It is an amenable number.

10020012021 is a deficient number, since it is larger than the sum of its proper divisors (4602549751).

10020012021 is a wasteful number, since it uses less digits than its factorization.

10020012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11477780 (or 11477777 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10020012021 its reverse (12021002001), we get a palindrome (22041014022).

The spelling of 10020012021 in words is "ten billion, twenty million, twelve thousand, twenty-one".