210221020121051 has 2 divisors, whose sum is σ = 210221020121052. Its totient is φ = 210221020121050.

The previous prime is 210221020120963. The next prime is 210221020121053. The reversal of 210221020121051 is 150121020122012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210221020121051 is a prime.

Together with 210221020121053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (210221020121053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110510060525 + 105110510060526.

It is an arithmetic number, because the mean of its divisors is an integer number (105110510060526).

Almost surely, 2^{210221020121051} is an apocalyptic number.

210221020121051 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221020121051 is an equidigital number, since it uses as much as digits as its factorization.

210221020121051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 210221020121051 its reverse (150121020122012), we get a palindrome (360342040243063).

The spelling of 210221020121051 in words is "two hundred ten trillion, two hundred twenty-one billion, twenty million, one hundred twenty-one thousand, fifty-one".