1021865818712 has 16 divisors (see below), whose sum is σ = 1933576378800. Its totient is φ = 506245451040.

The previous prime is 1021865818681. The next prime is 1021865818739. The reversal of 1021865818712 is 2178185681201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 585931364 + ... + 585933107.

It is an arithmetic number, because the mean of its divisors is an integer number (120848523675).

Almost surely, 2^{1021865818712} is an apocalyptic number.

It is an amenable number.

1021865818712 is a deficient number, since it is larger than the sum of its proper divisors (911710560088).

1021865818712 is a wasteful number, since it uses less digits than its factorization.

1021865818712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171864586 (or 1171864582 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 50.

The spelling of 1021865818712 in words is "one trillion, twenty-one billion, eight hundred sixty-five million, eight hundred eighteen thousand, seven hundred twelve".