21200113091 has 2 divisors, whose sum is σ = 21200113092. Its totient is φ = 21200113090.

The previous prime is 21200113063. The next prime is 21200113111. The reversal of 21200113091 is 19031100212.

It is an a-pointer prime, because the next prime (21200113111) can be obtained adding 21200113091 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21200113091 - 2¹⁰ = 21200112067 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200113021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600056545 + 10600056546.

It is an arithmetic number, because the mean of its divisors is an integer number (10600056546).

Almost surely, 2^21200113091 is an apocalyptic number.

21200113091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200113091 is an equidigital number, since it uses as much as digits as its factorization.

21200113091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21200113091 in words is "twenty-one billion, two hundred million, one hundred thirteen thousand, ninety-one".