21725550000 has 1440 divisors, whose sum is σ = 103068403200. Its totient is φ = 4276800000.

The previous prime is 21725549987. The next prime is 21725550017. The reversal of 21725550000 is 5552712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1143449991 + ... + 1143450009.

It is an arithmetic number, because the mean of its divisors is an integer number (71575280).

Almost surely, 2^21725550000 is an apocalyptic number.

21725550000 is a gapful number since it is divisible by the number (20) 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 21725550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51534201600).

21725550000 is an abundant number, since it is smaller than the sum of its proper divisors (81342853200).

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

21725550000 is a wasteful number, since it uses less digits than its factorization.

21725550000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The spelling of 21725550000 in words is "twenty-one billion, seven hundred twenty-five million, five hundred fifty thousand".