2121928275856 has 15 divisors (see below), whose sum is σ = 4111247323803. Its totient is φ = 1060961224560.

The previous prime is 2121928275833. The next prime is 2121928275877. The reversal of 2121928275856 is 6585728291212.

It is a happy number.

The square root of 2121928275856 is 1456684.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121928275856.

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 2 ways as a sum of consecutive naturals, for example, 5644651 + ... + 6008821.

Almost surely, 2^{2121928275856} is an apocalyptic number.

2121928275856 is the 1456684-th square number.

It is an amenable number.

2121928275856 is a deficient number, since it is larger than the sum of its proper divisors (1989319047947).

2121928275856 is an frugal number, since it uses more digits than its factorization.

2121928275856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728350 (or 364173 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 58.

The spelling of 2121928275856 in words is "two trillion, one hundred twenty-one billion, nine hundred twenty-eight million, two hundred seventy-five thousand, eight hundred fifty-six".