208142384421 has 4 divisors (see below), whose sum is σ = 277523179232. Its totient is φ = 138761589612.

The previous prime is 208142384399. The next prime is 208142384473. The reversal of 208142384421 is 124483241802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 208142384421 - 2¹¹ = 208142382373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 208142384421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208142384321) 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 in 3 ways as a sum of consecutive naturals, for example, 34690397401 + ... + 34690397406.

It is an arithmetic number, because the mean of its divisors is an integer number (69380794808).

Almost surely, 2^208142384421 is an apocalyptic number.

It is an amenable number.

208142384421 is a deficient number, since it is larger than the sum of its proper divisors (69380794811).

208142384421 is an equidigital number, since it uses as much as digits as its factorization.

208142384421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69380794810.

The product of its (nonzero) digits is 98304, while the sum is 39.

The spelling of 208142384421 in words is "two hundred eight billion, one hundred forty-two million, three hundred eighty-four thousand, four hundred twenty-one".