10001221122091 has 2 divisors, whose sum is σ = 10001221122092. Its totient is φ = 10001221122090.

The previous prime is 10001221122031. The next prime is 10001221122157. The reversal of 10001221122091 is 19022112210001.

10001221122091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10001221122091 - 2³¹ = 9999073638443 is a prime.

It is a super-2 number, since 2×10001221122091² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10001221122031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000610561045 + 5000610561046.

It is an arithmetic number, because the mean of its divisors is an integer number (5000610561046).

Almost surely, 2^{10001221122091} is an apocalyptic number.

10001221122091 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001221122091 is an equidigital number, since it uses as much as digits as its factorization.

10001221122091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 10001221122091 its reverse (19022112210001), we get a palindrome (29023333332092).

The spelling of 10001221122091 in words is "ten trillion, one billion, two hundred twenty-one million, one hundred twenty-two thousand, ninety-one".