1921777451472 has 40 divisors (see below), whose sum is σ = 4964641822944. Its totient is φ = 640586022784.

The previous prime is 1921777451471. The next prime is 1921777451513. The reversal of 1921777451472 is 2741547771291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921777451471) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8280403 + ... + 8509325.

Almost surely, 2^{1921777451472} is an apocalyptic number.

1921777451472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1921777451472 is an abundant number, since it is smaller than the sum of its proper divisors (3042864371472).

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

1921777451472 is a wasteful number, since it uses less digits than its factorization.

1921777451472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403827 (or 403821 counting only the distinct ones).

The product of its digits is 6914880, while the sum is 57.

The spelling of 1921777451472 in words is "one trillion, nine hundred twenty-one billion, seven hundred seventy-seven million, four hundred fifty-one thousand, four hundred seventy-two".