210021010020121 has 2 divisors, whose sum is σ = 210021010020122. Its totient is φ = 210021010020120.

The previous prime is 210021010020091. The next prime is 210021010020161. The reversal of 210021010020121 is 121020010120012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209986762446400 + 34247573721 = 14490920^2 + 185061^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021010020121 - 2⁷ = 210021010019993 is a prime.

It is not a weakly prime, because it can be changed into another prime (210021010020161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010505010060 + 105010505010061.

It is an arithmetic number, because the mean of its divisors is an integer number (105010505010061).

Almost surely, 2^{210021010020121} is an apocalyptic number.

It is an amenable number.

210021010020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021010020121 is an equidigital number, since it uses as much as digits as its factorization.

210021010020121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210021010020121 its reverse (121020010120012), we get a palindrome (331041020140133).

The spelling of 210021010020121 in words is "two hundred ten trillion, twenty-one billion, ten million, twenty thousand, one hundred twenty-one".