221020221221071 has 2 divisors, whose sum is σ = 221020221221072. Its totient is φ = 221020221221070.

The previous prime is 221020221221069. The next prime is 221020221221147. The reversal of 221020221221071 is 170122122020122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221020221221071 - 2¹ = 221020221221069 is a prime.

It is a super-2 number, since 2×221020221221071² (a number of 29 digits) contains 22 as substring.

Together with 221020221221069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020221222071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510110610535 + 110510110610536.

It is an arithmetic number, because the mean of its divisors is an integer number (110510110610536).

Almost surely, 2^{221020221221071} is an apocalyptic number.

221020221221071 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020221221071 is an equidigital number, since it uses as much as digits as its factorization.

221020221221071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 221020221221071 its reverse (170122122020122), we get a palindrome (391142343241193).

The spelling of 221020221221071 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, seventy-one".