1921028439772 has 72 divisors (see below), whose sum is σ = 3836034946800. Its totient is φ = 839054481408.

The previous prime is 1921028439721. The next prime is 1921028439817. The reversal of 1921028439772 is 2779348201291.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11851578 + ... + 12012574.

It is an arithmetic number, because the mean of its divisors is an integer number (53278263150).

Almost surely, 2^{1921028439772} is an apocalyptic number.

It is an amenable number.

1921028439772 is a deficient number, since it is larger than the sum of its proper divisors (1915006507028).

1921028439772 is a wasteful number, since it uses less digits than its factorization.

1921028439772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161975 (or 161960 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 1921028439772 in words is "one trillion, nine hundred twenty-one billion, twenty-eight million, four hundred thirty-nine thousand, seven hundred seventy-two".