19421071 has 4 divisors (see below), whose sum is σ = 19522944. Its totient is φ = 19319200.

The previous prime is 19421063. The next prime is 19421081. The reversal of 19421071 is 17012491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19421071 - 2³ = 19421063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19421081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50650 + ... + 51031.

It is an arithmetic number, because the mean of its divisors is an integer number (4880736).

Almost surely, 2^19421071 is an apocalyptic number.

19421071 is a deficient number, since it is larger than the sum of its proper divisors (101873).

19421071 is a wasteful number, since it uses less digits than its factorization.

19421071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101872.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 19421071 is about 4406.9344220217. The cubic root of 19421071 is about 268.7969843220.

The spelling of 19421071 in words is "nineteen million, four hundred twenty-one thousand, seventy-one".