221001212212867 has 2 divisors, whose sum is σ = 221001212212868. Its totient is φ = 221001212212866.

The previous prime is 221001212212843. The next prime is 221001212212877. The reversal of 221001212212867 is 768212212100122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221001212212867 is a prime.

It is not a weakly prime, because it can be changed into another prime (221001212212877) 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, 110500606106433 + 110500606106434.

It is an arithmetic number, because the mean of its divisors is an integer number (110500606106434).

Almost surely, 2^{221001212212867} is an apocalyptic number.

221001212212867 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001212212867 is an equidigital number, since it uses as much as digits as its factorization.

221001212212867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 37.

Adding to 221001212212867 its reverse (768212212100122), we get a palindrome (989213424312989).

The spelling of 221001212212867 in words is "two hundred twenty-one trillion, one billion, two hundred twelve million, two hundred twelve thousand, eight hundred sixty-seven".