21322021100209 has 2 divisors, whose sum is σ = 21322021100210. Its totient is φ = 21322021100208.

The previous prime is 21322021100183. The next prime is 21322021100267. The reversal of 21322021100209 is 90200112022312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10854026757025 + 10467994343184 = 3294545^2 + 3235428^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322021100209 - 2²⁵ = 21321987545777 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322021106209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661010550104 + 10661010550105.

It is an arithmetic number, because the mean of its divisors is an integer number (10661010550105).

Almost surely, 2^{21322021100209} is an apocalyptic number.

It is an amenable number.

21322021100209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322021100209 is an equidigital number, since it uses as much as digits as its factorization.

21322021100209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21322021100209 in words is "twenty-one trillion, three hundred twenty-two billion, twenty-one million, one hundred thousand, two hundred nine".