208290919321 has 9 divisors (see below), whose sum is σ = 217751764629. Its totient is φ = 199224751836.

The previous prime is 208290919313. The next prime is 208290919337. The reversal of 208290919321 is 123919092802.

The square root of 208290919321 is 456389.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 208290919321 - 2³ = 208290919313 is a prime.

It is a super-2 number, since 2×208290919321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208290919121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10487026 + ... + 10506868.

Almost surely, 2^208290919321 is an apocalyptic number.

208290919321 is the 456389-th square number.

208290919321 is the 228195-th centered octagonal number.

It is an amenable number.

208290919321 is a deficient number, since it is larger than the sum of its proper divisors (9460845308).

208290919321 is an frugal number, since it uses more digits than its factorization.

208290919321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39732 (or 19866 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 208290919321 in words is "two hundred eight billion, two hundred ninety million, nine hundred nineteen thousand, three hundred twenty-one".