208880219330721 has 27 divisors (see below), whose sum is σ = 306029754268147. Its totient is φ = 137290139563920.

The previous prime is 208880219330681. The next prime is 208880219330749. The reversal of 208880219330721 is 127033912088802.

The square root of 208880219330721 is 14452689.

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

208880219330721 is a `hidden beast` number, since 20 + 8 + 8 + 8 + 0 + 219 + 330 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 164227941371025 + 44652277959696 = 12815145^2 + 6682236^2 .

It is not a de Polignac number, because 208880219330721 - 2¹³ = 208880219322529 is a prime.

It is a super-2 number, since 2×208880219330721² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208880219330221) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3078388831 + ... + 3078456683.

Almost surely, 2^{208880219330721} is an apocalyptic number.

208880219330721 is the 14452689-th square number.

208880219330721 is the 7226345-th centered octagonal number.

It is an amenable number.

208880219330721 is a deficient number, since it is larger than the sum of its proper divisors (97149534937426).

208880219330721 is an frugal number, since it uses more digits than its factorization.

208880219330721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135854 (or 67927 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 208880219330721 in words is "two hundred eight trillion, eight hundred eighty billion, two hundred nineteen million, three hundred thirty thousand, seven hundred twenty-one".