20871845219 has 2 divisors, whose sum is σ = 20871845220. Its totient is φ = 20871845218.

The previous prime is 20871845179. The next prime is 20871845231. The reversal of 20871845219 is 91254817802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20871845219 - 2¹⁶ = 20871779683 is a prime.

It is a super-2 number, since 2×20871845219² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20871844219) 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, 10435922609 + 10435922610.

It is an arithmetic number, because the mean of its divisors is an integer number (10435922610).

Almost surely, 2^20871845219 is an apocalyptic number.

20871845219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20871845219 is an equidigital number, since it uses as much as digits as its factorization.

20871845219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 20871845219 in words is "twenty billion, eight hundred seventy-one million, eight hundred forty-five thousand, two hundred nineteen".