102171720000 has 280 divisors, whose sum is σ = 386064369856. Its totient is φ = 23353344000.

The previous prime is 102171719999. The next prime is 102171720023. The reversal of 102171720000 is 27171201.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 779184 + ... + 900816.

Almost surely, 2^102171720000 is an apocalyptic number.

102171720000 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 102171720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193032184928).

102171720000 is an abundant number, since it is smaller than the sum of its proper divisors (283892649856).

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

102171720000 is an equidigital number, since it uses as much as digits as its factorization.

102171720000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121675 (or 121650 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 21.

Adding to 102171720000 its reverse (27171201), we get a palindrome (102198891201).

The spelling of 102171720000 in words is "one hundred two billion, one hundred seventy-one million, seven hundred twenty thousand".