220925421809 has 2 divisors, whose sum is σ = 220925421810. Its totient is φ = 220925421808.

The previous prime is 220925421781. The next prime is 220925421811. The reversal of 220925421809 is 908124529022.

220925421809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217883568400 + 3041853409 = 466780^2 + 55153^2 .

It is a cyclic number.

It is not a de Polignac number, because 220925421809 - 2²⁸ = 220656986353 is a prime.

Together with 220925421811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220925421809.

It is not a weakly prime, because it can be changed into another prime (220925421869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110462710904 + 110462710905.

It is an arithmetic number, because the mean of its divisors is an integer number (110462710905).

Almost surely, 2^220925421809 is an apocalyptic number.

It is an amenable number.

220925421809 is a deficient number, since it is larger than the sum of its proper divisors (1).

220925421809 is an equidigital number, since it uses as much as digits as its factorization.

220925421809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 220925421809 in words is "two hundred twenty billion, nine hundred twenty-five million, four hundred twenty-one thousand, eight hundred nine".