211020011001221 has 2 divisors, whose sum is σ = 211020011001222. Its totient is φ = 211020011001220.

The previous prime is 211020011001203. The next prime is 211020011001271. The reversal of 211020011001221 is 122100110020112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144794773624900 + 66225237376321 = 12033070^2 + 8137889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211020011001221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211020011001196 and 211020011001205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211020011001271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510005500610 + 105510005500611.

It is an arithmetic number, because the mean of its divisors is an integer number (105510005500611).

Almost surely, 2^{211020011001221} is an apocalyptic number.

It is an amenable number.

211020011001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211020011001221 is an equidigital number, since it uses as much as digits as its factorization.

211020011001221 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 211020011001221 its reverse (122100110020112), we get a palindrome (333120121021333).

The spelling of 211020011001221 in words is "two hundred eleven trillion, twenty billion, eleven million, one thousand, two hundred twenty-one".