1001002221091 has 2 divisors, whose sum is σ = 1001002221092. Its totient is φ = 1001002221090.

The previous prime is 1001002221049. The next prime is 1001002221127. The reversal of 1001002221091 is 1901222001001.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1901222001001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001002221091 - 2⁷ = 1001002220963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001002227091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500501110545 + 500501110546.

It is an arithmetic number, because the mean of its divisors is an integer number (500501110546).

Almost surely, 2^{1001002221091} is an apocalyptic number.

1001002221091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001002221091 is an equidigital number, since it uses as much as digits as its factorization.

1001002221091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1001002221091 its reverse (1901222001001), we get a palindrome (2902224222092).

The spelling of 1001002221091 in words is "one trillion, one billion, two million, two hundred twenty-one thousand, ninety-one".