210010001020921 has 2 divisors, whose sum is σ = 210010001020922. Its totient is φ = 210010001020920.

The previous prime is 210010001020877. The next prime is 210010001021123. The reversal of 210010001020921 is 129020100010012.

It is a happy number.

210010001020921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162083733526521 + 47926267494400 = 12731211^2 + 6922880^2 .

It is a cyclic number.

It is not a de Polignac number, because 210010001020921 - 2³⁹ = 209460245207033 is a prime.

It is not a weakly prime, because it can be changed into another prime (210010001021921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105005000510460 + 105005000510461.

It is an arithmetic number, because the mean of its divisors is an integer number (105005000510461).

Almost surely, 2^{210010001020921} is an apocalyptic number.

It is an amenable number.

210010001020921 is a deficient number, since it is larger than the sum of its proper divisors (1).

210010001020921 is an equidigital number, since it uses as much as digits as its factorization.

210010001020921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 210010001020921 its reverse (129020100010012), we get a palindrome (339030101030933).

The spelling of 210010001020921 in words is "two hundred ten trillion, ten billion, one million, twenty thousand, nine hundred twenty-one".