1212021119989 has 2 divisors, whose sum is σ = 1212021119990. Its totient is φ = 1212021119988.

The previous prime is 1212021119987. The next prime is 1212021120031. The reversal of 1212021119989 is 9899111202121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 782428702500 + 429592417489 = 884550^2 + 655433^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212021119989 - 2¹ = 1212021119987 is a prime.

Together with 1212021119987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212021119987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606010559994 + 606010559995.

It is an arithmetic number, because the mean of its divisors is an integer number (606010559995).

Almost surely, 2^{1212021119989} is an apocalyptic number.

It is an amenable number.

1212021119989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212021119989 is an equidigital number, since it uses as much as digits as its factorization.

1212021119989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 46.

The spelling of 1212021119989 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred nineteen thousand, nine hundred eighty-nine".