19243123213391 has 32 divisors (see below), whose sum is σ = 25035101568000. Its totient is φ = 14342374126080.

The previous prime is 19243123213357. The next prime is 19243123213393. The reversal of 19243123213391 is 19331232134291.

It is a happy number.

It is not a de Polignac number, because 19243123213391 - 2¹⁴ = 19243123197007 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 (19243123213393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101115815 + ... + 101305943.

It is an arithmetic number, because the mean of its divisors is an integer number (782346924000).

Almost surely, 2^{19243123213391} is an apocalyptic number.

19243123213391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19243123213391 is a deficient number, since it is larger than the sum of its proper divisors (5791978354609).

19243123213391 is a wasteful number, since it uses less digits than its factorization.

19243123213391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247319.

The product of its digits is 209952, while the sum is 44.

The spelling of 19243123213391 in words is "nineteen trillion, two hundred forty-three billion, one hundred twenty-three million, two hundred thirteen thousand, three hundred ninety-one".