1221021485833 has 2 divisors, whose sum is σ = 1221021485834. Its totient is φ = 1221021485832.

The previous prime is 1221021485819. The next prime is 1221021485861. The reversal of 1221021485833 is 3385841201221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1067981698624 + 153039787209 = 1033432^2 + 391203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221021485833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221021482833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510742916 + 610510742917.

It is an arithmetic number, because the mean of its divisors is an integer number (610510742917).

Almost surely, 2^{1221021485833} is an apocalyptic number.

It is an amenable number.

1221021485833 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221021485833 is an equidigital number, since it uses as much as digits as its factorization.

1221021485833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 1221021485833 in words is "one trillion, two hundred twenty-one billion, twenty-one million, four hundred eighty-five thousand, eight hundred thirty-three".