1221221000071 has 2 divisors, whose sum is σ = 1221221000072. Its totient is φ = 1221221000070.

The previous prime is 1221221000057. The next prime is 1221221000161. The reversal of 1221221000071 is 1700001221221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1700001221221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221221000071 - 2²⁷ = 1221086782343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221221000011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610500035 + 610610500036.

It is an arithmetic number, because the mean of its divisors is an integer number (610610500036).

Almost surely, 2^{1221221000071} is an apocalyptic number.

1221221000071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221000071 is an equidigital number, since it uses as much as digits as its factorization.

1221221000071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 1221221000071 its reverse (1700001221221), we get a palindrome (2921222221292).

The spelling of 1221221000071 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, seventy-one", and thus it is an aban number.