1002211219981 has 2 divisors, whose sum is σ = 1002211219982. Its totient is φ = 1002211219980.

The previous prime is 1002211219979. The next prime is 1002211220011. The reversal of 1002211219981 is 1899121122001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 905028768900 + 97182451081 = 951330^2 + 311741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002211219981 - 2¹ = 1002211219979 is a prime.

It is a super-2 number, since 2×1002211219981² (a number of 25 digits) contains 22 as substring.

Together with 1002211219979, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1002211219981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002211219951) 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, 501105609990 + 501105609991.

It is an arithmetic number, because the mean of its divisors is an integer number (501105609991).

Almost surely, 2^{1002211219981} is an apocalyptic number.

It is an amenable number.

1002211219981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002211219981 is an equidigital number, since it uses as much as digits as its factorization.

1002211219981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 1002211219981 in words is "one trillion, two billion, two hundred eleven million, two hundred nineteen thousand, nine hundred eighty-one".