1222121019989 has 2 divisors, whose sum is σ = 1222121019990. Its totient is φ = 1222121019988.

The previous prime is 1222121019961. The next prime is 1222121020007. The reversal of 1222121019989 is 9899101212221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 839990580100 + 382130439889 = 916510^2 + 618167^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222121019989 - 2³⁶ = 1153401543253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222121019919) 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, 611060509994 + 611060509995.

It is an arithmetic number, because the mean of its divisors is an integer number (611060509995).

Almost surely, 2^{1222121019989} is an apocalyptic number.

It is an amenable number.

1222121019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222121019989 is an equidigital number, since it uses as much as digits as its factorization.

1222121019989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 47.

The spelling of 1222121019989 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, nineteen thousand, nine hundred eighty-nine".