1043644084921 has 9 divisors (see below), whose sum is σ = 1045946703333. Its totient is φ = 1041346531260.

The previous prime is 1043644084909. The next prime is 1043644084927. The reversal of 1043644084921 is 1294804463401.

The square root of 1043644084921 is 1021589.

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

It is not a de Polignac number, because 1043644084921 - 2³⁹ = 493888271033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1043644084927) 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 8 ways as a sum of consecutive naturals, for example, 644621850 + ... + 644623468.

Almost surely, 2^{1043644084921} is an apocalyptic number.

1043644084921 is the 1021589-th square number.

1043644084921 is the 510795-th centered octagonal number.

It is an amenable number.

1043644084921 is a deficient number, since it is larger than the sum of its proper divisors (2302618412).

1043644084921 is an frugal number, since it uses more digits than its factorization.

1043644084921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500 (or 2250 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 1043644084921 in words is "one trillion, forty-three billion, six hundred forty-four million, eighty-four thousand, nine hundred twenty-one".