10021221010091 has 2 divisors, whose sum is σ = 10021221010092. Its totient is φ = 10021221010090.

The previous prime is 10021221010081. The next prime is 10021221010271. The reversal of 10021221010091 is 19001012212001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10021221010091 - 2¹⁰ = 10021221009067 is a prime.

It is not a weakly prime, because it can be changed into another prime (10021221010081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010610505045 + 5010610505046.

It is an arithmetic number, because the mean of its divisors is an integer number (5010610505046).

Almost surely, 2^{10021221010091} is an apocalyptic number.

10021221010091 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021221010091 is an equidigital number, since it uses as much as digits as its factorization.

10021221010091 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 20.

Adding to 10021221010091 its reverse (19001012212001), we get a palindrome (29022233222092).

The spelling of 10021221010091 in words is "ten trillion, twenty-one billion, two hundred twenty-one million, ten thousand, ninety-one".