208038686921 has 8 divisors (see below), whose sum is σ = 227197180224. Its totient is φ = 189330981840.

The previous prime is 208038686903. The next prime is 208038686953. The reversal of 208038686921 is 129686830802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 208038686921 - 2¹⁸ = 208038424777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (208038686981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112696091 + ... + 112697936.

It is an arithmetic number, because the mean of its divisors is an integer number (28399647528).

Almost surely, 2^208038686921 is an apocalyptic number.

It is an amenable number.

208038686921 is a deficient number, since it is larger than the sum of its proper divisors (19158493303).

208038686921 is a wasteful number, since it uses less digits than its factorization.

208038686921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225394111.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 208038686921 in words is "two hundred eight billion, thirty-eight million, six hundred eighty-six thousand, nine hundred twenty-one".