16685003421 has 6 divisors (see below), whose sum is σ = 24100560510. Its totient is φ = 11123335608.

The previous prime is 16685003417. The next prime is 16685003437. The reversal of 16685003421 is 12430058661.

It is a happy number.

16685003421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9601256196 + 7083747225 = 97986^2 + 84165^2 .

It is not a de Polignac number, because 16685003421 - 2² = 16685003417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16685003411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 926944626 + ... + 926944643.

It is an arithmetic number, because the mean of its divisors is an integer number (4016760085).

Almost surely, 2^16685003421 is an apocalyptic number.

It is an amenable number.

16685003421 is a deficient number, since it is larger than the sum of its proper divisors (7415557089).

16685003421 is a wasteful number, since it uses less digits than its factorization.

16685003421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853889275 (or 1853889272 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 16685003421 in words is "sixteen billion, six hundred eighty-five million, three thousand, four hundred twenty-one".