221001221212087 has 2 divisors, whose sum is σ = 221001221212088. Its totient is φ = 221001221212086.

The previous prime is 221001221212039. The next prime is 221001221212151. The reversal of 221001221212087 is 780212122100122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221001221212087 is a prime.

It is a super-2 number, since 2×221001221212087² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221001221222087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500610606043 + 110500610606044.

It is an arithmetic number, because the mean of its divisors is an integer number (110500610606044).

Almost surely, 2^{221001221212087} is an apocalyptic number.

221001221212087 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001221212087 is an equidigital number, since it uses as much as digits as its factorization.

221001221212087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The spelling of 221001221212087 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, two hundred twelve thousand, eighty-seven".