19921196643 has 8 divisors (see below), whose sum is σ = 26655453888. Its totient is φ = 13233868584.

The previous prime is 19921196629. The next prime is 19921196681. The reversal of 19921196643 is 34669112991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19921196643 - 2¹³ = 19921188451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19921196143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11731305 + ... + 11733002.

It is an arithmetic number, because the mean of its divisors is an integer number (3331931736).

Almost surely, 2^19921196643 is an apocalyptic number.

19921196643 is a deficient number, since it is larger than the sum of its proper divisors (6734257245).

19921196643 is a wasteful number, since it uses less digits than its factorization.

19921196643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23464593.

The product of its digits is 629856, while the sum is 51.

The spelling of 19921196643 in words is "nineteen billion, nine hundred twenty-one million, one hundred ninety-six thousand, six hundred forty-three".