1222212011987 has 2 divisors, whose sum is σ = 1222212011988. Its totient is φ = 1222212011986.

The previous prime is 1222212011983. The next prime is 1222212012037. The reversal of 1222212011987 is 7891102122221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1222212011987 - 2² = 1222212011983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222212011987.

It is not a weakly prime, because it can be changed into another prime (1222212011983) 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, 611106005993 + 611106005994.

It is an arithmetic number, because the mean of its divisors is an integer number (611106005994).

Almost surely, 2^{1222212011987} is an apocalyptic number.

1222212011987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222212011987 is an equidigital number, since it uses as much as digits as its factorization.

1222212011987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 1222212011987 in words is "one trillion, two hundred twenty-two billion, two hundred twelve million, eleven thousand, nine hundred eighty-seven".