1921289843236 has 27 divisors (see below), whose sum is σ = 3370978275483. Its totient is φ = 958159633560.

The previous prime is 1921289843171. The next prime is 1921289843267. The reversal of 1921289843236 is 6323489821291.

The square root of 1921289843236 is 1386106.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1560754741 + ... + 1560755971.

Almost surely, 2^{1921289843236} is an apocalyptic number.

1921289843236 is the 1386106-th square number.

It is an amenable number.

1921289843236 is a deficient number, since it is larger than the sum of its proper divisors (1449688432247).

1921289843236 is an frugal number, since it uses more digits than its factorization.

1921289843236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592 (or 1796 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 58.

The spelling of 1921289843236 in words is "one trillion, nine hundred twenty-one billion, two hundred eighty-nine million, eight hundred forty-three thousand, two hundred thirty-six".