1221021011071 has 2 divisors, whose sum is σ = 1221021011072. Its totient is φ = 1221021011070.

The previous prime is 1221021011057. The next prime is 1221021011101. The reversal of 1221021011071 is 1701101201221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1701101201221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221021011071 - 2¹¹ = 1221021009023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221021011051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510505535 + 610510505536.

It is an arithmetic number, because the mean of its divisors is an integer number (610510505536).

Almost surely, 2^{1221021011071} is an apocalyptic number.

1221021011071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221021011071 is an equidigital number, since it uses as much as digits as its factorization.

1221021011071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 1221021011071 its reverse (1701101201221), we get a palindrome (2922122212292).

The spelling of 1221021011071 in words is "one trillion, two hundred twenty-one billion, twenty-one million, eleven thousand, seventy-one".