211121100011221 has 2 divisors, whose sum is σ = 211121100011222. Its totient is φ = 211121100011220.

The previous prime is 211121100011183. The next prime is 211121100011273. The reversal of 211121100011221 is 122110001121112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144507181800996 + 66613918210225 = 12021114^2 + 8161735^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121100011221 - 2¹¹ = 211121100009173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121100011195 and 211121100011204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121100711221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560550005610 + 105560550005611.

It is an arithmetic number, because the mean of its divisors is an integer number (105560550005611).

Almost surely, 2^{211121100011221} is an apocalyptic number.

It is an amenable number.

211121100011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121100011221 is an equidigital number, since it uses as much as digits as its factorization.

211121100011221 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 16.

Adding to 211121100011221 its reverse (122110001121112), we get a palindrome (333231101132333).

The spelling of 211121100011221 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred million, eleven thousand, two hundred twenty-one".