1221111983827 has 2 divisors, whose sum is σ = 1221111983828. Its totient is φ = 1221111983826.

The previous prime is 1221111983813. The next prime is 1221111983837. The reversal of 1221111983827 is 7283891111221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221111983827 - 2⁷ = 1221111983699 is a prime.

It is a super-2 number, since 2×1221111983827² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221111983837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610555991913 + 610555991914.

It is an arithmetic number, because the mean of its divisors is an integer number (610555991914).

Almost surely, 2^{1221111983827} is an apocalyptic number.

1221111983827 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221111983827 is an equidigital number, since it uses as much as digits as its factorization.

1221111983827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 46.

The spelling of 1221111983827 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, nine hundred eighty-three thousand, eight hundred twenty-seven".