126821871682 has 12 divisors (see below), whose sum is σ = 209098871478. Its totient is φ = 57646305200.

The previous prime is 126821871667. The next prime is 126821871713. The reversal of 126821871682 is 286178128621.

It can be written as a sum of positive squares in only one way, i.e., 121660742401 + 5161129281 = 348799^2 + 71841^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 262028419 + ... + 262028902.

Almost surely, 2^126821871682 is an apocalyptic number.

126821871682 is a deficient number, since it is larger than the sum of its proper divisors (82276999796).

126821871682 is a wasteful number, since it uses less digits than its factorization.

126821871682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524057345 (or 524057334 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The spelling of 126821871682 in words is "one hundred twenty-six billion, eight hundred twenty-one million, eight hundred seventy-one thousand, six hundred eighty-two".