19973271 has 4 divisors (see below), whose sum is σ = 26631032. Its totient is φ = 13315512.

The previous prime is 19973267. The next prime is 19973281. The reversal of 19973271 is 17237991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17237991 = 3 ⋅5745997.

It is not a de Polignac number, because 19973271 - 2² = 19973267 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 (19973201) 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 3 ways as a sum of consecutive naturals, for example, 3328876 + ... + 3328881.

It is an arithmetic number, because the mean of its divisors is an integer number (6657758).

Almost surely, 2^19973271 is an apocalyptic number.

19973271 is a deficient number, since it is larger than the sum of its proper divisors (6657761).

19973271 is an equidigital number, since it uses as much as digits as its factorization.

19973271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6657760.

The product of its digits is 23814, while the sum is 39.

The square root of 19973271 is about 4469.1465628238. The cubic root of 19973271 is about 271.3207849696.

The spelling of 19973271 in words is "nineteen million, nine hundred seventy-three thousand, two hundred seventy-one".