1021683888644 has 12 divisors (see below), whose sum is σ = 1799335002444. Its totient is φ = 507588173664.

The previous prime is 1021683888509. The next prime is 1021683888679. The reversal of 1021683888644 is 4468883861201.

It can be written as a sum of positive squares in 2 ways, for example, as 476980847044 + 544703041600 = 690638^2 + 738040^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813441959 + ... + 813443214.

It is an arithmetic number, because the mean of its divisors is an integer number (149944583537).

Almost surely, 2^{1021683888644} is an apocalyptic number.

It is an amenable number.

1021683888644 is a deficient number, since it is larger than the sum of its proper divisors (777651113800).

1021683888644 is a wasteful number, since it uses less digits than its factorization.

1021683888644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626885334 (or 1626885332 counting only the distinct ones).

The product of its (nonzero) digits is 14155776, while the sum is 59.

The spelling of 1021683888644 in words is "one trillion, twenty-one billion, six hundred eighty-three million, eight hundred eighty-eight thousand, six hundred forty-four".