1021797789320 has 256 divisors, whose sum is σ = 3004074086400. Its totient is φ = 303300264960.

The previous prime is 1021797789281. The next prime is 1021797789349. The reversal of 1021797789320 is 239877971201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16190867 + ... + 16253853.

It is an arithmetic number, because the mean of its divisors is an integer number (11734664400).

Almost surely, 2^{1021797789320} is an apocalyptic number.

1021797789320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021797789320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1502037043200).

1021797789320 is an abundant number, since it is smaller than the sum of its proper divisors (1982276297080).

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

1021797789320 is a wasteful number, since it uses less digits than its factorization.

1021797789320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63268 (or 63264 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 56.

The spelling of 1021797789320 in words is "one trillion, twenty-one billion, seven hundred ninety-seven million, seven hundred eighty-nine thousand, three hundred twenty".