16919093421 has 6 divisors (see below), whose sum is σ = 24438690510. Its totient is φ = 11279395608.

The previous prime is 16919093393. The next prime is 16919093437. The reversal of 16919093421 is 12439091961.

It can be written as a sum of positive squares in only one way, i.e., 16130270025 + 788823396 = 127005^2 + 28086^2 .

It is not a de Polignac number, because 16919093421 - 2⁶ = 16919093357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16919093441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 939949626 + ... + 939949643.

It is an arithmetic number, because the mean of its divisors is an integer number (4073115085).

Almost surely, 2^16919093421 is an apocalyptic number.

It is an amenable number.

16919093421 is a deficient number, since it is larger than the sum of its proper divisors (7519597089).

16919093421 is a wasteful number, since it uses less digits than its factorization.

16919093421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879899275 (or 1879899272 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 16919093421 in words is "sixteen billion, nine hundred nineteen million, ninety-three thousand, four hundred twenty-one".