8103680721 has 20 divisors (see below), whose sum is σ = 12108076992. Its totient is φ = 5401303128.

The previous prime is 8103680701. The next prime is 8103680729. The reversal of 8103680721 is 1270863018.

It is not a de Polignac number, because 8103680721 - 2¹¹ = 8103678673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8103680729) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 558460 + ... + 572786.

Almost surely, 2^8103680721 is an apocalyptic number.

8103680721 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8103680721 is a deficient number, since it is larger than the sum of its proper divisors (4004396271).

8103680721 is a wasteful number, since it uses less digits than its factorization.

8103680721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21322 (or 21313 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 8103680721 is about 90020.4461275326. The cubic root of 8103680721 is about 2008.6030012083.

The spelling of 8103680721 in words is "eight billion, one hundred three million, six hundred eighty thousand, seven hundred twenty-one".