1221111022099 has 2 divisors, whose sum is σ = 1221111022100. Its totient is φ = 1221111022098.

The previous prime is 1221111022093. The next prime is 1221111022189. The reversal of 1221111022099 is 9902201111221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221111022099 - 2⁹ = 1221111021587 is a prime.

It is a super-2 number, since 2×1221111022099² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221111022099.

It is not a weakly prime, because it can be changed into another prime (1221111022093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610555511049 + 610555511050.

It is an arithmetic number, because the mean of its divisors is an integer number (610555511050).

Almost surely, 2^{1221111022099} is an apocalyptic number.

1221111022099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221111022099 is an equidigital number, since it uses as much as digits as its factorization.

1221111022099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 1221111022099 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, twenty-two thousand, ninety-nine".