1021720912068 has 24 divisors (see below), whose sum is σ = 2387622160000. Its totient is φ = 340058394720.

The previous prime is 1021720912031. The next prime is 1021720912103. The reversal of 1021720912068 is 8602190271201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64397068 + ... + 64412931.

Almost surely, 2^{1021720912068} is an apocalyptic number.

It is an amenable number.

1021720912068 is an abundant number, since it is smaller than the sum of its proper divisors (1365901247932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021720912068 is a wasteful number, since it uses less digits than its factorization.

1021720912068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128810667 (or 128810665 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The spelling of 1021720912068 in words is "one trillion, twenty-one billion, seven hundred twenty million, nine hundred twelve thousand, sixty-eight".