16003670921 has 24 divisors (see below), whose sum is σ = 19095686280. Its totient is φ = 13368499200.

The previous prime is 16003670869. The next prime is 16003670941. The reversal of 16003670921 is 12907630061.

It can be written as a sum of positive squares in 4 ways, for example, as 92371321 + 15911299600 = 9611^2 + 126140^2 .

It is not a de Polignac number, because 16003670921 - 2¹⁰ = 16003669897 is a prime.

It is a super-2 number, since 2×16003670921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16003670941) 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, 301241 + ... + 350361.

It is an arithmetic number, because the mean of its divisors is an integer number (795653595).

Almost surely, 2^16003670921 is an apocalyptic number.

It is an amenable number.

16003670921 is a deficient number, since it is larger than the sum of its proper divisors (3092015359).

16003670921 is a wasteful number, since it uses less digits than its factorization.

16003670921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49305 (or 49298 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The spelling of 16003670921 in words is "sixteen billion, three million, six hundred seventy thousand, nine hundred twenty-one".