19163421 has 12 divisors (see below), whose sum is σ = 27852448. Its totient is φ = 12696264.

The previous prime is 19163401. The next prime is 19163429. The reversal of 19163421 is 12436191.

19163421 is a `hidden beast` number, since 1 + 9 + 1 + 634 + 21 = 666.

It is not a de Polignac number, because 19163421 - 2⁷ = 19163293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19163429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5065 + ... + 7998.

Almost surely, 2^19163421 is an apocalyptic number.

It is an amenable number.

19163421 is a deficient number, since it is larger than the sum of its proper divisors (8689027).

19163421 is a wasteful number, since it uses less digits than its factorization.

19163421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13232 (or 13229 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 19163421 is about 4377.6044819056. The cubic root of 19163421 is about 267.6030220120.

The spelling of 19163421 in words is "nineteen million, one hundred sixty-three thousand, four hundred twenty-one".