171222720000 has 400 divisors, whose sum is σ = 579855386880. Its totient is φ = 44870656000.

The previous prime is 171222719959. The next prime is 171222720013. The reversal of 171222720000 is 27222171.

It is a tau number, because it is divible by the number of its divisors (400).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 56638489 + ... + 56641511.

Almost surely, 2^171222720000 is an apocalyptic number.

171222720000 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 171222720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289927693440).

171222720000 is an abundant number, since it is smaller than the sum of its proper divisors (408632666880).

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

171222720000 is an frugal number, since it uses more digits than its factorization.

171222720000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123 (or 3092 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

Adding to 171222720000 its reverse (27222171), we get a palindrome (171249942171).

The spelling of 171222720000 in words is "one hundred seventy-one billion, two hundred twenty-two million, seven hundred twenty thousand".