9201721398750 has 560 divisors, whose sum is σ = 27480699861120. Its totient is φ = 2302456104000.

The previous prime is 9201721398739. The next prime is 9201721398757. The reversal of 9201721398750 is 578931271029.

It is a happy number.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9201721398757) by changing a digit.

It is a polite number, since it can be written in 279 ways as a sum of consecutive naturals, for example, 1852568767 + ... + 1852573733.

Almost surely, 2^{9201721398750} is an apocalyptic number.

9201721398750 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9201721398750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13740349930560).

9201721398750 is an abundant number, since it is smaller than the sum of its proper divisors (18278978462370).

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

9201721398750 is a wasteful number, since it uses less digits than its factorization.

9201721398750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133 (or 5103 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 9201721398750 in words is "nine trillion, two hundred one billion, seven hundred twenty-one million, three hundred ninety-eight thousand, seven hundred fifty".