10210021021 has 2 divisors, whose sum is σ = 10210021022. Its totient is φ = 10210021020.

The previous prime is 10210021001. The next prime is 10210021061. The reversal of 10210021021 is 12012001201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5692702500 + 4517318521 = 75450^2 + 67211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10210021021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10210020989 and 10210021007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10210021001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105010510 + 5105010511.

It is an arithmetic number, because the mean of its divisors is an integer number (5105010511).

Almost surely, 2^10210021021 is an apocalyptic number.

It is an amenable number.

10210021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10210021021 is an equidigital number, since it uses as much as digits as its factorization.

10210021021 is an evil number, because the sum of its binary digits is even.

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

Adding to 10210021021 its reverse (12012001201), we get a palindrome (22222022222).

The spelling of 10210021021 in words is "ten billion, two hundred ten million, twenty-one thousand, twenty-one".