1921024804965 has 16 divisors (see below), whose sum is σ = 3512731072128. Its totient is φ = 878182767936.

The previous prime is 1921024804943. The next prime is 1921024804973. The reversal of 1921024804965 is 5694084201291.

It is a happy number.

It is not a de Polignac number, because 1921024804965 - 2⁹ = 1921024804453 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9147737062 + ... + 9147737271.

It is an arithmetic number, because the mean of its divisors is an integer number (219545692008).

Almost surely, 2^{1921024804965} is an apocalyptic number.

1921024804965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921024804965 is a deficient number, since it is larger than the sum of its proper divisors (1591706267163).

1921024804965 is a wasteful number, since it uses less digits than its factorization.

1921024804965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18295474348.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 1921024804965 in words is "one trillion, nine hundred twenty-one billion, twenty-four million, eight hundred four thousand, nine hundred sixty-five".