1021542789796 has 9 divisors (see below), whose sum is σ = 1787703419649. Its totient is φ = 510770384184.

The previous prime is 1021542789779. The next prime is 1021542789803. The reversal of 1021542789796 is 6979872451201.

The square root of 1021542789796 is 1010714.

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., 282864422500 + 738678367296 = 531850^2 + 859464^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1768750 + ... + 2274106.

Almost surely, 2^{1021542789796} is an apocalyptic number.

1021542789796 is the 1010714-th square number.

It is an amenable number.

1021542789796 is a deficient number, since it is larger than the sum of its proper divisors (766160629853).

1021542789796 is an frugal number, since it uses more digits than its factorization.

1021542789796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010718 (or 505359 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 1021542789796 in words is "one trillion, twenty-one billion, five hundred forty-two million, seven hundred eighty-nine thousand, seven hundred ninety-six".