21020220110191 has 2 divisors, whose sum is σ = 21020220110192. Its totient is φ = 21020220110190.

The previous prime is 21020220110189. The next prime is 21020220110207. The reversal of 21020220110191 is 19101102202012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020220110191 - 2¹ = 21020220110189 is a prime.

It is a super-3 number, since 3×21020220110191³ (a number of 41 digits) contains 333 as substring.

Together with 21020220110189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020220116191) 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, 10510110055095 + 10510110055096.

It is an arithmetic number, because the mean of its divisors is an integer number (10510110055096).

Almost surely, 2^{21020220110191} is an apocalyptic number.

21020220110191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020220110191 is an equidigital number, since it uses as much as digits as its factorization.

21020220110191 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 21020220110191 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred ten thousand, one hundred ninety-one".