44392191921 has 96 divisors (see below), whose sum is σ = 82642599936. Its totient is φ = 22284720000.

The previous prime is 44392191913. The next prime is 44392191967. The reversal of 44392191921 is 12919129344.

44392191921 is a `hidden beast` number, since 4 + 439 + 2 + 191 + 9 + 21 = 666.

It is not a de Polignac number, because 44392191921 - 2³ = 44392191913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (44392191821) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23351071 + ... + 23352971.

It is an arithmetic number, because the mean of its divisors is an integer number (860860416).

Almost surely, 2^44392191921 is an apocalyptic number.

It is an amenable number.

44392191921 is a deficient number, since it is larger than the sum of its proper divisors (38250408015).

44392191921 is a wasteful number, since it uses less digits than its factorization.

44392191921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043 (or 3040 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The spelling of 44392191921 in words is "forty-four billion, three hundred ninety-two million, one hundred ninety-one thousand, nine hundred twenty-one".