1921282073856 has 108 divisors (see below), whose sum is σ = 5744697827232. Its totient is φ = 640427337216.

The previous prime is 1921282073849. The next prime is 1921282073857. The reversal of 1921282073856 is 6583702821291.

1921282073856 is a `hidden beast` number, since 19 + 21 + 28 + 207 + 385 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921282073857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15380196 + ... + 15504611.

Almost surely, 2^{1921282073856} is an apocalyptic number.

1921282073856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1921282073856 is an abundant number, since it is smaller than the sum of its proper divisors (3823415753376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1921282073856 is an frugal number, since it uses more digits than its factorization.

1921282073856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30884838 (or 30884812 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 1921282073856 in words is "one trillion, nine hundred twenty-one billion, two hundred eighty-two million, seventy-three thousand, eight hundred fifty-six".