210010001021 has 2 divisors, whose sum is σ = 210010001022. Its totient is φ = 210010001020.

The previous prime is 210010001011. The next prime is 210010001051. The reversal of 210010001021 is 120100010012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167845896100 + 42164104921 = 409690^2 + 205339^2 .

It is a cyclic number.

It is not a de Polignac number, because 210010001021 - 2¹⁴ = 210009984637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210010001011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105005000510 + 105005000511.

It is an arithmetic number, because the mean of its divisors is an integer number (105005000511).

Almost surely, 2^210010001021 is an apocalyptic number.

It is an amenable number.

210010001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210010001021 is an equidigital number, since it uses as much as digits as its factorization.

210010001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 210010001021 its reverse (120100010012), we get a palindrome (330110011033).

The spelling of 210010001021 in words is "two hundred ten billion, ten million, one thousand, twenty-one".