1999022721424 has 45 divisors (see below), whose sum is σ = 3889955225313. Its totient is φ = 995182096896.

The previous prime is 1999022721359. The next prime is 1999022721469. The reversal of 1999022721424 is 4241272209991.

The square root of 1999022721424 is 1413868.

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

It can be written as a sum of positive squares in only one way, i.e., 818062363024 + 1180960358400 = 904468^2 + 1086720^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1600497952 + ... + 1600499200.

Almost surely, 2^{1999022721424} is an apocalyptic number.

1999022721424 is the 1413868-th square number.

It is an amenable number.

1999022721424 is a deficient number, since it is larger than the sum of its proper divisors (1890932503889).

1999022721424 is an frugal number, since it uses more digits than its factorization.

1999022721424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072 (or 1534 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 1999022721424 in words is "one trillion, nine hundred ninety-nine billion, twenty-two million, seven hundred twenty-one thousand, four hundred twenty-four".