8199930921 has 24 divisors (see below), whose sum is σ = 13696591104. Its totient is φ = 4325237280.

The previous prime is 8199930913. The next prime is 8199930923. The reversal of 8199930921 is 1290399918.

It is not a de Polignac number, because 8199930921 - 2³ = 8199930913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8199930923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2143545 + ... + 2147366.

It is an arithmetic number, because the mean of its divisors is an integer number (570691296).

Almost surely, 2^8199930921 is an apocalyptic number.

It is an amenable number.

8199930921 is a deficient number, since it is larger than the sum of its proper divisors (5496660183).

8199930921 is a wasteful number, since it uses less digits than its factorization.

8199930921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290941 (or 4290934 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 8199930921 is about 90553.4699556014. The cubic root of 8199930921 is about 2016.5240126065.

The spelling of 8199930921 in words is "eight billion, one hundred ninety-nine million, nine hundred thirty thousand, nine hundred twenty-one".