21210011022091 has 2 divisors, whose sum is σ = 21210011022092. Its totient is φ = 21210011022090.

The previous prime is 21210011022061. The next prime is 21210011022127. The reversal of 21210011022091 is 19022011001212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210011022091 - 2⁵ = 21210011022059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210011022061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605005511045 + 10605005511046.

It is an arithmetic number, because the mean of its divisors is an integer number (10605005511046).

Almost surely, 2^{21210011022091} is an apocalyptic number.

21210011022091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210011022091 is an equidigital number, since it uses as much as digits as its factorization.

21210011022091 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 21210011022091 in words is "twenty-one trillion, two hundred ten billion, eleven million, twenty-two thousand, ninety-one".