921798436672 has 14 divisors (see below), whose sum is σ = 1829193772898. Its totient is φ = 460899218304.

The previous prime is 921798436627. The next prime is 921798436673. The reversal of 921798436672 is 276634897129.

It can be written as a sum of positive squares in only one way, i.e., 900266982976 + 21531453696 = 948824^2 + 146736^2 .

It is a Harshad number since it is a multiple of its sum of digits (64), and also a Moran number because the ratio is a prime number: 14403100573 = 921798436672 / (9 + 2 + 1 + 7 + 9 + 8 + 4 + 3 + 6 + 6 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921798436673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7201550223 + ... + 7201550350.

Almost surely, 2^921798436672 is an apocalyptic number.

It is an amenable number.

921798436672 is a deficient number, since it is larger than the sum of its proper divisors (907395336226).

921798436672 is a wasteful number, since it uses less digits than its factorization.

921798436672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14403100585 (or 14403100575 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 64.

The spelling of 921798436672 in words is "nine hundred twenty-one billion, seven hundred ninety-eight million, four hundred thirty-six thousand, six hundred seventy-two".