1020221100091 has 2 divisors, whose sum is σ = 1020221100092. Its totient is φ = 1020221100090.

The previous prime is 1020221100083. The next prime is 1020221100109. The reversal of 1020221100091 is 1900011220201.

It is a happy number.

Together with next prime (1020221100109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020221100091 - 2³ = 1020221100083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020221100061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110550045 + 510110550046.

It is an arithmetic number, because the mean of its divisors is an integer number (510110550046).

Almost surely, 2^{1020221100091} is an apocalyptic number.

1020221100091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020221100091 is an equidigital number, since it uses as much as digits as its factorization.

1020221100091 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1020221100091 its reverse (1900011220201), we get a palindrome (2920232320292).

The spelling of 1020221100091 in words is "one trillion, twenty billion, two hundred twenty-one million, one hundred thousand, ninety-one".