210221021100121 has 2 divisors, whose sum is σ = 210221021100122. Its totient is φ = 210221021100120.

The previous prime is 210221021100049. The next prime is 210221021100143. The reversal of 210221021100121 is 121001120122012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148039295779600 + 62181725320521 = 12167140^2 + 7885539^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221021100121 - 2¹⁹ = 210221020575833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221021100095 and 210221021100104.

It is not a weakly prime, because it can be changed into another prime (210221021100191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110510550060 + 105110510550061.

It is an arithmetic number, because the mean of its divisors is an integer number (105110510550061).

Almost surely, 2^{210221021100121} is an apocalyptic number.

It is an amenable number.

210221021100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221021100121 is an equidigital number, since it uses as much as digits as its factorization.

210221021100121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210221021100121 its reverse (121001120122012), we get a palindrome (331222141222133).

The spelling of 210221021100121 in words is "two hundred ten trillion, two hundred twenty-one billion, twenty-one million, one hundred thousand, one hundred twenty-one".