19921145973 has 16 divisors (see below), whose sum is σ = 28029961920. Its totient is φ = 12550070016.

The previous prime is 19921145971. The next prime is 19921145977. The reversal of 19921145973 is 37954112991.

It is not a de Polignac number, because 19921145973 - 2¹ = 19921145971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19921145971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417540 + ... + 462797.

It is an arithmetic number, because the mean of its divisors is an integer number (1751872620).

Almost surely, 2^19921145973 is an apocalyptic number.

It is an amenable number.

19921145973 is a deficient number, since it is larger than the sum of its proper divisors (8108815947).

19921145973 is a wasteful number, since it uses less digits than its factorization.

19921145973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880756.

The product of its digits is 612360, while the sum is 51.

The spelling of 19921145973 in words is "nineteen billion, nine hundred twenty-one million, one hundred forty-five thousand, nine hundred seventy-three".