1921311773385 has 32 divisors (see below), whose sum is σ = 3207879763200. Its totient is φ = 980109427968.

The previous prime is 1921311773369. The next prime is 1921311773503. The reversal of 1921311773385 is 5833771131291.

It is not a de Polignac number, because 1921311773385 - 2⁴ = 1921311773369 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10228291 + ... + 10414439.

It is an arithmetic number, because the mean of its divisors is an integer number (100246242600).

Almost surely, 2^{1921311773385} is an apocalyptic number.

1921311773385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921311773385 is a deficient number, since it is larger than the sum of its proper divisors (1286567989815).

1921311773385 is a wasteful number, since it uses less digits than its factorization.

1921311773385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216097.

The product of its digits is 952560, while the sum is 51.

The spelling of 1921311773385 in words is "one trillion, nine hundred twenty-one billion, three hundred eleven million, seven hundred seventy-three thousand, three hundred eighty-five".