1017820684021 has 16 divisors (see below), whose sum is σ = 1056468331008. Its totient is φ = 979543857600.

The previous prime is 1017820684019. The next prime is 1017820684061. The reversal of 1017820684021 is 1204860287101.

It is a cyclic number.

It is not a de Polignac number, because 1017820684021 - 2¹ = 1017820684019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1017820684061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8291931 + ... + 8413783.

It is an arithmetic number, because the mean of its divisors is an integer number (66029270688).

Almost surely, 2^{1017820684021} is an apocalyptic number.

It is an amenable number.

1017820684021 is a deficient number, since it is larger than the sum of its proper divisors (38647646987).

1017820684021 is a wasteful number, since it uses less digits than its factorization.

1017820684021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123372.

The product of its (nonzero) digits is 43008, while the sum is 40.

The spelling of 1017820684021 in words is "one trillion, seventeen billion, eight hundred twenty million, six hundred eighty-four thousand, twenty-one".