221021100010121 has 2 divisors, whose sum is σ = 221021100010122. Its totient is φ = 221021100010120.

The previous prime is 221021100010103. The next prime is 221021100010127. The reversal of 221021100010121 is 121010001120122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139239174001225 + 81781926008896 = 11799965^2 + 9043336^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021100010121 - 2⁶ = 221021100010057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221021100010096 and 221021100010105.

It is not a weakly prime, because it can be changed into another prime (221021100010127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510550005060 + 110510550005061.

It is an arithmetic number, because the mean of its divisors is an integer number (110510550005061).

Almost surely, 2^{221021100010121} is an apocalyptic number.

It is an amenable number.

221021100010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021100010121 is an equidigital number, since it uses as much as digits as its factorization.

221021100010121 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 14.

Adding to 221021100010121 its reverse (121010001120122), we get a palindrome (342031101130243).

The spelling of 221021100010121 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred million, ten thousand, one hundred twenty-one".