21002110210091 has 2 divisors, whose sum is σ = 21002110210092. Its totient is φ = 21002110210090.

The previous prime is 21002110210063. The next prime is 21002110210163. The reversal of 21002110210091 is 19001201120012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002110210091 - 2¹⁴ = 21002110193707 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002110210691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501055105045 + 10501055105046.

It is an arithmetic number, because the mean of its divisors is an integer number (10501055105046).

Almost surely, 2^{21002110210091} is an apocalyptic number.

21002110210091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002110210091 is an equidigital number, since it uses as much as digits as its factorization.

21002110210091 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 20.

The spelling of 21002110210091 in words is "twenty-one trillion, two billion, one hundred ten million, two hundred ten thousand, ninety-one".