1221018026827 has 2 divisors, whose sum is σ = 1221018026828. Its totient is φ = 1221018026826.

The previous prime is 1221018026779. The next prime is 1221018026857. The reversal of 1221018026827 is 7286208101221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221018026827 - 2¹⁵ = 1221017994059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221018026827.

It is not a weakly prime, because it can be changed into another prime (1221018026857) 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, 610509013413 + 610509013414.

It is an arithmetic number, because the mean of its divisors is an integer number (610509013414).

Almost surely, 2^{1221018026827} is an apocalyptic number.

1221018026827 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221018026827 is an equidigital number, since it uses as much as digits as its factorization.

1221018026827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 40.

The spelling of 1221018026827 in words is "one trillion, two hundred twenty-one billion, eighteen million, twenty-six thousand, eight hundred twenty-seven".